Add initial test scripts for GitHub API interactions

- Created TEMPLATE.ps1 for Pester tests with a template structure.
- Added Teams.Tests.ps1 to test GitHub Teams API functionalities including team creation, retrieval, updating, and deletion.
- Introduced Users.Tests.ps1 to validate user-related API calls, including user retrieval and updates.
- Implemented Variables.Tests.ps1 to manage GitHub repository variables, including setting, updating, and removing variables.

Author: MariusStorhaug

.github/PSModule.yml

@@ -1,17 +1,17 @@
 Test:
   CodeCoverage:
     PercentTarget: 50
-#   TestResults:
-#     Skip: true
-#   SourceCode:
-#     Skip: true
-#   PSModule:
-#     Skip: true
-#   Module:
-#     Windows:
-#       Skip: true
-#     MacOS:
-#       Skip: true
-# Build:
-#   Docs:
-#     Skip: true
+  TestResults:
+    Skip: true
+  SourceCode:
+    Skip: true
+  PSModule:
+    Skip: true
+  Module:
+    Windows:
+      Skip: true
+    MacOS:
+      Skip: true
+Build:
+  Docs:
+    Skip: true