Fix: Product Category can be recreated with the same name, description & color tag. #1074

[MehdiMsa]

Description

In this pull request, I have been able to create a README.md documentation file in German. In addition, Problem with the Product Category and Product Replication has been fixed. With this change, if you attempt to create a new product with a name that already exists in the database, MongoDB will throw a duplicate key error, preventing the creation of duplicate products with the same name.

Related Issues

If this pull request is related to any issue(s), please list them here.

https://github.com/idurar/idurar-erp-crm/issues/1074

Steps to Test

1. Login
2. Go to 'Products Category Section'
3. Click on 'Add New Product Category'
4. Fill in the information & create the Product Category
5. Click on 'Add New Product Category'
6. Recreate another Product Category with the same data

Screenshots (if applicable)

Checklist

• [x] I have tested these changes
• [x] I have updated the relevant documentation
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the codebase
• [x] My changes generate no new warnings or errors
• [x] The title of my pull request is clear and descriptive