add contributing

CONTRIBUTING.md

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+How to contribute to ffplayout engine
+-----
+
+#### Did you need general help?
+
+- Search in all issues if your question was already ask.
+- Please give a detailed explanation of your problem and your goal.
+    - Give as much information as you can, like:
+        1. which system you are using
+        2. python version
+        3. ffmpeg version and libs
+        4. your ffplayout.yml config file
+        5. your log files
+- Ask your question in a way, that we don't need to ask for more details and background.
+- Please have in mind that this is no WhatsApp, and don't.
+
+#### Did you found a bug?
+
+Please use the **Bug Report** issue template and fill up everything.
+
+#### You have a feature request?
+
+Please use the **Feature Request** issue template and fill up everything.
+
+#### You want to make a pull request?
+That is wonderful! But please use the same code style. This project tries to be PEP8 conform.