Adding basic examples (RGB blink, LoRaWAN TH sensor app)

[azerimaker]

Summary:

I needed basic test codes for testing the board functionality, therefore I copied the basic and the basic_lorawan examples into basic_blink and basic_lorawan_th and added required functionalities, while remodeling the unnecessary ones.

Why do we need this?

basic_blink is needed to serve as a barebones project to start with. basic_lorawan_th is needed to run real-world tests on the nodes.

What is already there? What do you see now?

The basic and the basic_lorawan examples are great for testing the basic board functionality but didn't serve the purpose.

What is missing? What do you want to see?

Having a barebones (template project) for starting new project.

How do you propose to implement this?

basic_blink serves as a barebones project. Many of the test functions have been removed from the main, but the code have been kept in case someone wants to add only the necessary readings.

Environment:

Baremetal.

Acceptance Criteria:

• All basic application compile without warnings.
• Sensor reading code is a bit hacky, but does the job for now.

What can you do yourself and what do you need help with?

@elsalahy, @marnixcro please take a look at the basic_lorawan_th branch and let me know if anything need to be changed.

[elsalahy]

@azerimaker I think instead of calling it basic_blink, I recommend creating a an app called template and for temperature humidity app, I think #178 will cover the same functionality