feat: add CONTRIBUTING.md and LICENSE files for project guidelines and legal terms

LICENSE

@@ -0,0 +1,42 @@
+Proprietary Software License
+
+Copyright (c) 2026 CrowMate Team. All rights reserved.
+
+This software and associated documentation files (the "Software") are the
+proprietary and confidential information of the CrowMate Team.
+
+RESTRICTIONS:
+
+1. The Software is licensed, not sold. This license does not grant you any
+   rights to use the Software except as expressly permitted herein.
+
+2. You may not:
+   - Copy, modify, or distribute the Software
+   - Reverse engineer, decompile, or disassemble the Software
+   - Remove or alter any proprietary notices or labels on the Software
+   - Use the Software for commercial purposes without explicit permission
+   - Transfer, sublicense, or lease the Software to any third party
+
+3. This Software is provided for development and internal use by authorized
+   CrowMate Team members and approved contributors only.
+
+4. All contributions to this Software become the property of the CrowMate Team
+   and are subject to this license.
+
+AUTHORIZED USE:
+
+This Software is part of the Headless Hazard community platform project.
+Access and contribution rights are granted on a case-by-case basis by the
+CrowMate Team.
+
+DISCLAIMER:
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+For licensing inquiries or permission requests, contact the CrowMate Team.