Update Documentation / Update README.md (#72)

Description
-----------
Reflect the changes from master to main branch. 

Test Steps
-----------
NA.

Checklist:
----------
- [ x ] I have tested my changes. No regression in existing tests.
- [NA] I have modified and/or added unit-tests to cover the code changes
in this Pull Request.

Related Issue
-----------
NA.

By submitting this pull request, I confirm that you can use, modify,
copy, and redistribute this contribution, under the terms of your
choice.

Author: mackel90

README.md

@@ -32,8 +32,8 @@ Add the following into your project's main or a subdirectory's `CMakeLists.txt`:
 include(FetchContent)
 
 FetchContent_Declare( freertos_plus_fat
-  GIT_REPOSITORY https://github.com/FreeRTOS/Lab-Project-FreeRTOS-FAT.git
-  GIT_TAG        master #Note: Best practice to use specific git-hash or tagged version
+  GIT_REPOSITORY "https://github.com/FreeRTOS/Lab-Project-FreeRTOS-FAT.git"
+  GIT_TAG        main #Note: Best practice to use specific git-hash or tagged version
   GIT_SUBMODULES "" # Don't grab any submodules since not latest
 )