Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing guidelines
+
+## Reporting an issue [![](https://isitmaintained.com/badge/resolution/zeffy/wufuc.svg)](https://isitmaintained.com/project/zeffy/wufuc)
+
+#### Before you create an issue, please make sure of the following:
+
+- Are you using at least the [latest stable version](../../releases/latest)?
+- If you previously used any of the old batchfile patches, did you revert it by running `repair_wuaueng.dll.bat`?
+- Have you tried restarting your computer?
+
+#### After you've confirmed those things, get a complete debug log by doing the following:
+
+1. Download a program from Microsoft called [DebugView](https://technet.microsoft.com/en-us/sysinternals/debugview.aspx).
+2. Start `Dbgview.exe` as administrator and check `Capture -> Capture Global Win32`.
+3. Restart wufuc and `wuauserv` by running `debugview_helper.bat` as administrator.
+4. Output will be shown in DebugView, copy/paste this text into your issue.
+
+This is necessary because there isn't really a way for wufuc to directly interact with your desktop to show you error messages, as it runs outside the context of a normal user session, just like a system service.
+
+Any new issues that don't have debug logs (when relevant) will be closed immediately and the poster directed to the contributing guidelines.
+
+#### Other helpful information to include when reporting issues:
+
+- What build are you using? Stable release or unstable AppVeyor builds?
+- What version of Windows are you using? (e.g., Windows 7 x64)
+- What is the file version or SHA-1 hash of `C:\Windows\System32\wuaueng.dll`?
+- Any other information you feel is relevant to your issue.