Add CC BY-NC 4.0 license badge

Added CC BY-NC 4.0 license badge to README.

Author: Shuvo-code-dev

README.md

@@ -1,5 +1,5 @@
 # Halqa
 A minimalist, community-driven platform for A-Z free coding resources and roadmaps.
 
-
 ![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)
+![License: CC BY-NC 4.0](https://img.shields.io/badge/License-CC%20BY--NC%204.0-lightgrey.svg)