Add pull request template.

Author: nojaf

.github/pull_request_template.md

@@ -0,0 +1,19 @@
+# Before you go
+
+Hi there! Thank you for your contribution to our project. To help maintain the quality of our codebase, our Continuous Integration (CI) system will automatically run several checks on your submission. To streamline the process, we kindly ask you to perform these checks locally before pushing your changes:
+
+To execute all build scripts, please run:
+
+```shell
+dotnet fsi build.fsx
+```
+
+If you encounter any formatting issues, you can auto-correct them by running:
+
+```shell
+dotnet fantomas build.fsx src tests docs
+```
+
+Should any tests fail, please review and adjust your changes accordingly.
+
+We appreciate your efforts to contribute and look forward to reviewing your pull request!