Add Contributing.md

Author: tomteipl

Contributing.md

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+# Contributing to Ollama-GUI-Chat
+
+## Reporting an Issue
+
+You can report an issue thru GitHub [issues](https://github.com/tomteipl/Ollama-GUI-Chat/issues).
+
+Include as much information as possible, like:
+
+* Version of the app
+* Your OS
+* Steps to reproduce the issue
+* Overall description of the issue
+
+## Improving the App
+
+Feel free to fork the project and make changes.
+Python modules used in repo are:
+
+* [`customtkinter`](https://customtkinter.tomschimansky.com/)
+* [`requests`](https://pypi.org/project/requests/)
+* [`tkinter`](https://docs.python.org/3/library/tkinter.html) - should be installed by default
+* [`os`](https://docs.python.org/3/library/os.html) - should be installed by default
+* [`json`](https://docs.python.org/3/library/json.html) - should be installed by default
+
+Remember to comment your new code as much as possible.
+It will help others to understand your changes.
+
+Next, create a [pull request](https://github.com/tomteipl/Ollama-GUI-Chat/pulls)
+with your changes.
+Include a description of your changes, why you made them
+and how they work.
+
+>[!IMPORTANT]
+>Windows and Linux versions have to be as similar as possible.
+>If you are able to test your changes on both systems, it would be great.
+
+### Thank you
+
+I really appreciate your help in improving the app.
+Thank you for considering contributing to [Ollama-GUI-Chat]!
+Im grateful for the support of this community and
+encourage contributions from everyone.