docs: Added initial PR template with directions for doc only changes and squash merges [no ci]

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

@@ -0,0 +1 @@
+- [ ] I have read the [contributing guidelines](CONTRIBUTING.md)

CONTRIBUTING.md

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+# Contributing Guidelines
+
+## Checklist
+
+* Make sure your PR follows the [coding guidelines](https://github.com/ggerganov/llama.cpp/blob/master/README.md#coding-guidelines)
+* Test your changes using the commands in the [`tests`](tests) folder. For instance, running the `./tests/test-backend-ops` command tests different backend implementations of the GGML library
+* Execute [the full CI locally on your machine](ci/README.md) before publishing
+
+## PR formatting
+
+* Please rate the complexity of your PR (i.e. `easy`, `medium`, `hard`). This makes it easier for maintainers to triage the PRs.
+* If the pull request only contains documentation changes (e.g., updating
+READMEs, adding new wiki pages), please add `[no ci]` to the commit title. This will skip unnecessary CI checks and help reduce build times.
+* When squashing multiple commits on merge, use the following format for your commit title: `<module> : <commit title> (#<issue_number>)`. For example: `utils : Fix typo in utils.py (#1234)`

README.md

@@ -1088,6 +1088,7 @@ docker run --gpus all -v /path/to/models:/models local/llama.cpp:server-cuda -m
 
 - Contributors can open PRs
 - Collaborators can push to branches in the `llama.cpp` repo and merge PRs into the `master` branch
+- Collaborators should follow the [PR template](.github/PULL_REQUEST_TEMPLATE/pull_request_template.md) when adding a PR
 - Collaborators will be invited based on contributions
 - Any help with managing issues and PRs is very appreciated!
 - Make sure to read this: [Inference at the edge](https://github.com/ggerganov/llama.cpp/discussions/205)