doc: restructure directories and add README

[Shabirmean]

Description

• This PR is one of the many to come where we re-arrange the directory structure of the repo
• Currently the sample application is nested inside a folder called point-of-sale-app from the root of the repo
• Ideally we want to bring everything inside that folder to the root of the repo and delete this folder
• Also we want to move the anthos-baremetal-edge-deployment ansible scripts to the anthos-samples repository
• As a first step I am moving everything inside the point-of-sale-app folder to the top level of the repo whilst this is kept as is
• We do this because there are content that is referencing this directory. Once we identify them and update them, we can delete this folder

Changes

• Move everything inside the point-of-sale-app folder to the root of the repo
• Put all the source code specific directories (api-server, inventory, payments, ui, service-sdk) into a folder called src
• Add a new folder called docs at the root which will have all the different guideline docs
• Add a new doc to explain the QuickStart for deploying the sample application to a GKE cluster

[snippet-bot[bot]]

Here is the summary of possible violations 😱

There is a format violation for a region tag.

• skaffold.yaml:83, tag anthosbaremetal_point_of_sale_app_skaffold_config_load-balancer

The end of the violation section. All the stuff below is FYI purposes only.

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Here is the summary of changes.

You are about to add 23 region tags.

- [k8-manifests/api-server-lb.yaml:15](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/k8-manifests/api-server-lb.yaml#L15), tag `anthosbaremetal_k8_manifests_api_server_lb_service_api_server_lb` - [k8-manifests/dev/api-server.yaml:15](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/k8-manifests/dev/api-server.yaml#L15), tag `anthosbaremetal_dev_api_server_deployment_api_server` - [k8-manifests/dev/api-server.yaml:68](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/k8-manifests/dev/api-server.yaml#L68), tag `anthosbaremetal_dev_api_server_service_api_server_svc` - [k8-manifests/dev/inventory.yaml:15](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/k8-manifests/dev/inventory.yaml#L15), tag `anthosbaremetal_dev_inventory_deployment_inventory` - [k8-manifests/dev/inventory.yaml:73](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/k8-manifests/dev/inventory.yaml#L73), tag `anthosbaremetal_dev_inventory_service_inventory_svc` - [k8-manifests/dev/payments.yaml:15](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/k8-manifests/dev/payments.yaml#L15), tag `anthosbaremetal_dev_payments_deployment_payments` - [k8-manifests/dev/payments.yaml:57](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/k8-manifests/dev/payments.yaml#L57), tag `anthosbaremetal_dev_payments_service_payments_svc` - [k8-manifests/mysql-db.yaml:15](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/k8-manifests/mysql-db.yaml#L15), tag `anthosbaremetal_k8_manifests_mysql_db_statefulset_mysql_db` - [k8-manifests/mysql-db.yaml:63](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/k8-manifests/mysql-db.yaml#L63), tag `anthosbaremetal_k8_manifests_mysql_db_service_mysql_db` - [k8-manifests/mysql-db.yaml:83](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/k8-manifests/mysql-db.yaml#L83), tag `anthosbaremetal_k8_manifests_mysql_db_configmap_mysql_db_mysql_db_config` - [k8-manifests/release/api-server.yaml:15](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/k8-manifests/release/api-server.yaml#L15), tag `anthosbaremetal_release_api_server_deployment_api_server` - [k8-manifests/release/api-server.yaml:69](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/k8-manifests/release/api-server.yaml#L69), tag `anthosbaremetal_release_api_server_service_api_server_svc` - [k8-manifests/release/inventory.yaml:15](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/k8-manifests/release/inventory.yaml#L15), tag `anthosbaremetal_release_inventory_deployment_inventory` - [k8-manifests/release/inventory.yaml:74](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/k8-manifests/release/inventory.yaml#L74), tag `anthosbaremetal_release_inventory_service_inventory_svc` - [k8-manifests/release/payments.yaml:15](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/k8-manifests/release/payments.yaml#L15), tag `anthosbaremetal_release_payments_deployment_payments` - [k8-manifests/release/payments.yaml:58](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/k8-manifests/release/payments.yaml#L58), tag `anthosbaremetal_release_payments_service_payments_svc` - [k8-manifests/service-configs.yaml:15](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/k8-manifests/service-configs.yaml#L15), tag `anthosbaremetal_k8_manifests_service_configs_configmap_service_configs` - [k8-manifests/springprofile-h2.yaml:20](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/k8-manifests/springprofile-h2.yaml#L20), tag `anthosbaremetal_k8_manifests_springprofile_h2_configmap_spring_profile` - [k8-manifests/springprofile-mysql.yaml:20](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/k8-manifests/springprofile-mysql.yaml#L20), tag `anthosbaremetal_k8_manifests_springprofile_mysql_configmap_spring_profile` - [skaffold.yaml:15](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/skaffold.yaml#L15), tag `anthosbaremetal_point_of_sale_app_skaffold_config_setup` - [skaffold.yaml:26](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/skaffold.yaml#L26), tag `anthosbaremetal_point_of_sale_app_skaffold_config_db` - [skaffold.yaml:44](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/skaffold.yaml#L44), tag `anthosbaremetal_point_of_sale_app_skaffold_config_backend` - [skaffold.yaml:83](https://github.com/GoogleCloudPlatform/point-of-sale/blob/217553e78664151cc1006e8fb0c87bbe4c1b6e1d/skaffold.yaml#L83), tag `anthosbaremetal_point_of_sale_app_skaffold_config_load-balancer`

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