Implement Overte Authentication and Add Test Entities

- Added documentation for Overte authentication implementation in `docs/OVERTE_AUTH.md`.
- Introduced new GLB files for cube and sphere primitives in `examples/primitives/`.
- Created a JSON file `examples/test_entities.json` containing sample entities for testing.
- Added a build and test script `scripts/build_and_test.sh` for streamlined building and verification of the project.
- Implemented a CI test runner script `scripts/ci-test.sh` to automate testing processes.
- Created a script `scripts/run_with_auth.sh` to facilitate running the Starworld client with Overte authentication.

README.md

@@ -36,7 +36,7 @@ Starworld is an [Overte](https://overte.org) client that renders virtual world e
 
 ### Build Everything
 ```bash
-./build_and_test.sh
+./scripts/build_and_test.sh
 ```
 
 Or manually:
@@ -213,7 +213,10 @@ Starworld/
 │   ├── src/lib.rs
 │   └── Cargo.toml
 ├── tests/            # Test harness
-└── tools/            # Python utilities
+├── tools/            # Python utilities
+├── scripts/          # Build and utility scripts
+├── docs/             # Documentation files
+└── examples/         # Example configurations and models
 ```
 
 ### Debugging