Create CONTRIBUTOR_LICENSE_AGREEMENT.md (#16)

Author: huayra

CONTRIBUTOR_LICENSE_AGREEMENT.md

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+# TinyKVM Contributor License Agreement
+
+Thank you for your interest in contributing to TinyKVM and VMOD-TinyKVM
+(the "Project"). By submitting a Contribution to this Project, you agree to
+the following terms.
+
+## 1. Definitions
+
+- **Contribution**: Any code, documentation, or other materials you submit.
+- **Project**: The TinyKVM/VMOD-TinyKVM codebase, distributed under GPL‑3.0 for
+  open source purposes and subject to a commercial license by Varnish Software.
+
+## 2. Grant of Rights
+
+By contributing, you grant Varnish Software and the Project a worldwide,
+royalty‑free, non‑exclusive, perpetual, and irrevocable license to use,
+reproduce, modify, and distribute your Contribution under the terms of:
+- The GNU General Public License (GPL‑3.0), and/or
+- A commercial license as determined by Varnish Software.
+
+## 3. Representations and Warranties
+
+You represent that:
+- Your Contribution is your original work.
+- You have the right to grant the above licenses.
+- Your Contribution does not infringe on any third-party rights.
+
+## 4. Patent License
+
+You grant a patent license to any patents you hold that are necessarily infringed
+by your Contribution.
+
+## 5. Acknowledgement
+
+By submitting your Contribution, you acknowledge that you have read and agree
+to the terms of this Contributor License Agreement.