Initial import

CONTRIBUTING.md

@@ -0,0 +1,56 @@
+# Contributor License Agreement (CLA)
+
+A "Contributor" is any person or entity that intentionally submits copyrighted material to the project,
+including but not limited to code, documentation, or other material, via a pull request, issue, or other means.
+
+By submitting a contribution Contributor agrees to the following terms:
+
+## Dual AGPLv3/MIT License Grant
+Contributor agrees that their contribution is provided under the GNU Affero General Public License v3 (AGPLv3) reproduced
+in the file [LICENSE](LICENSE) or any later version and, in addition, grants the contribution under the MIT License terms below:
+
+```text
+Permission is hereby granted, free of charge, to any person obtaining a copy  
+of this software and associated documentation files (the "Software"), to deal  
+in the Software without restriction, including without limitation the rights  
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell  
+copies of the Software, and to permit persons to whom the Software is  
+furnished to do so, subject to the following conditions:  
+
+The above copyright notice and this permission notice shall be included in all  
+copies or substantial portions of the Software.  
+
+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.  
+```
+
+## Annotating contributions to source code
+
+### Trivial changes
+Trivial changes (e.g., 1-2 line fixes or typo fixes) inherit the AGPLv3 license of the project and without further annotation are also licensed under MIT as specified above.
+
+### Functions and nontrivial snippets of code 
+Functions and nontrivial snippets of code by default inherit the AGPLv3 license of the project and are also licensed under MIT as specified above. They shall be marked in a PR with an SPDX header as in this example:
+  ```
+  # SPDX-License-Identifier: AGPL-3.0-or-later OR MIT
+  # Copyright (c) [Year] [Contributor Name]
+  void frobnicate(int ntet)
+  {
+  ...
+  }
+  ```
+
+## Representations and Warranties
+Contributor represents that:
+- They are legally entitled to grant the above licenses;
+- Their contributions are original works and do not violate third-party rights;
+- They are not required to grant licenses under third-party terms (e.g., employer agreements).
+
+## No Obligation
+The Project is under no obligation to accept or use any contribution.
+