Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contribution Policy the E-Paper Calendar software
+
+Thanks for contributing to the E-Paper Calendar Software!
+
+If you wish to contribute, please test your suggestion for at least one week on your own E-Paper first. Often, a small change makes a lot
+of difference so it's important to check how well your suggestion can perform. 
+
+A testing time for 1 week is set as the E-Paper software takes 1 days for a daily cycle, 7 days for a weekly cycle and 1 month for a 
+montly cycle. Usually, if it works for the daily and weekly cycle, there shouldn't be any issues in the monthly cycle.
+
+# Submitting Issues
+
+Please only submit reproducible issues and write the instructions on how to reproduce them.
+
+When you are submitting a new issue, please supply the following information:
+
+* **Version info;** Copy the data inside the Info.txt file (`/home/pi/E-Paper-Master/Info.txt`). If there's no such file, you are using an outdated version. Please consider updating.
+
+* **Error output:** Any errors of the Main script can be found in `/home/pi/E-Paper-Master/E-Paper-err.log`. You don't need to copy the entire file (please don't) but rather the latest errors that occured.
+
+* **Changes made:** If you have made any changes (apart from personal information), also include them to help debugging.
+
+* **Description**: Provide a detailed description about the issue and include specific details to help us understand the problem. Adding screenshots will help describing the problem.
+
+* **Steps to reproduce:** List the step by step process to reproduce the issue.
+
+* **Results**: Describe what you expected to see and what you actually saw.
+
+* **Additional Notes:** Provide any other relevant notes not previously mentioned. This is optional.