TASK: add pull request templates for satilite libs

To prevent people from creating a pr, add a template with instructions

Author: jaapio

.gitattributes

@@ -2,3 +2,4 @@
 /docs export-ignore
 /tests export-ignore
 /.gitignore export-ignore
+.github export-ignore

.github/pull_request_template.md

@@ -0,0 +1,18 @@
+# Contribute to the phpDocumentor Guides
+
+## Go to the mono-repository
+
+This project is developed in the mono-repository `phpDocumentor Guides <https://github.com/phpDocumentor/guides>`__.
+The repository you are currently in gets auto-created by splitting the mono-repository. You **must not** contribute
+to this repository directly but always to the mono-repository linked above.
+
+## Create Issues
+
+*   If you find something missing or something is wrong in this library, you are welcome to write an issue
+    describing the problem: `Issues on GitHub <https://github.com/phpDocumentor/guides/issues>`__.
+*   If you can, please try to fix the problem yourself.
+
+# Make changes (create pull requests)
+
+See the `Contribution chapter <https://github.com/phpDocumentor/guides/tree/main/docs/contributions/index.rst>`__ in the
+`Documentation` <https://github.com/phpDocumentor/guides/tree/main/docs/index.rst>`__.