Merge pull request 'jf/cla+templates' (#6) from jf/cla+templates into main

Reviewed-on: https://codeberg.org/TetGen/TetGen/pulls/6

.github/issue_template.md

@@ -0,0 +1,22 @@
+Thank you very much for your interest in TetGen! Reporting your issue helps to improve the code.
+
+### Legal
+By opening this issue, you agree to the terms of the Contributor License Agreement (CLA) stated in [CONTRIBUTING.md](https://codeberg.org/TetGen/TetGen/src/branch/main/CONTRIBUTING.md).
+
+### Kind of issue (bug, feature request...):
+
+### Issue description:
+
+### Expected behavior: 
+
+### Observed behavior: 
+
+### Environment:
+   - TeGen version:
+   - OS (e.g. MacOS 14):
+   - Architecture (e.g. x64, aarch64):
+   - Compiler vendor + version:
+
+### Minimum working example:
+
+Please attach input data which allow to reproduce the problem.

.github/pull_request_template.md

@@ -0,0 +1,12 @@
+Thank you very much for helping to improve TetGen!
+
+### Legal:
+By opening this pull request, you agree to the terms of the Contributor License Agreement (CLA) stated in [CONTRIBUTING.md](https://codeberg.org/TetGen/TetGen/src/branch/main/CONTRIBUTING.md).
+
+- [ ] I have read and agree to the Contributor License Agreement in CONTRIBUTING.md
+
+### Pull request description:
+
+
+### Test data:
+Please provide input data which help to test the feature implemented in the pull request.

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.
+

README.md

@@ -28,3 +28,8 @@ It is planned to resume active development of TetGen in cooperation between the
 TetGen versions developed at WIAS are distributed under a dual licensing scheme.  As an alternative to the use of TetGen under the AGPLv3 license, consider the option to obtain a commercial license for a fee.  These licenses are offered by the Weierstrass Institute for Applied Analysis and Stochastics (WIAS). As a rule, licenses are provided "as-is", unlimited in time for a one time fee.  Please send corresponding requests to: `tetgen at wias-berlin.de`.  Please do not forget to include some description of your company and the realm of its activities.
 
 Details about the extension of this dual licensing scheme for future versions of TetGen will be announced in due time.
+
+## Contributing
+
+By submitting a contribution (including but not limited to code, documentation, or other materials) via a pull request, issue, or other means, a contributor agrees to the terms of the contributor license agreement stated in [CONTRIBUTING.md](CONTRIBUTING.md). It is planned to revise this agreement, once the extension of the dual licensing scheme has been set up.
+