This pull request introduces a new sample called SimpleSyncCheck to the project, which demonstrates synchronized color changes across clients using the NetSync system. The main addition is the ChangeColor script, which handles color changes via RPC and global variable synchronization, along with supporting asset and metadata files.

New sample functionality for color synchronization

• Added ChangeColor script (ChangeColor.cs) that listens for RPCs and global variable changes to update the color of a target renderer, supporting both remote and global variable-based synchronization.
• The script includes multiple color options and provides methods to trigger color changes via RPC or global variable updates, with debug logging for easier troubleshooting.

Supporting assets for the sample

• Added a material asset (Screen.mat) and its metadata for use in the sample scene. [1] [2]
• Included metadata files for the sample folder, script, and scene to ensure proper Unity asset management. (SimpleSyncCheck.meta, ChangeColor.cs.meta, SyncCheck.unity.meta) [1] [2] [3]