Add issue template (#242)

Author: chamons

Diff for: ISSUE_TEMPLATE.md

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+<!-- 🚨 STOP 🚨 𝗦𝗧𝗢𝗣 🚨 𝑺𝑻𝑶𝑷 🚨 -->
+
+<!--
+Please fill in the *entire* template below.
+The template is designed to avoid unnecessary delays to confirm and fix reported issues. Issues with missing information generally end up with a `need-info` label and take significantly more time to fix. Please help us help you!
+For more information see https://github.com/xamarin/xamarin-macios/wiki/Submitting-Bugs-&-Suggestions
+For support requests use https://www.xamarin.com/support
+-->
+### Steps to Reproduce
+
+<!--If there is a specific swift language feature that triggers this issue, please include a minimal snippet that causes it. -->
+
+1. 
+2. 
+3. 
+
+### Expected Behavior
+
+### Actual Behavior
+
+### Environment
+
+<!--
+1.
+Visual Studio: Help > About Microsoft Visual Studio > Copy Info [button]
+Visual Studio for Mac: Visual Studio > About Visual Studio > Show Details > Copy Information [button]
+2. Paste into the code block below (between ```)
+-->
+
+```
+```
+
+### Build Logs
+
+<!--
+1. Place cursor below this comment block.
+2. Attach build log or link to gist (https://gist.github.com/) of the log.
+3. Logs can be found in the Build Output tab of the Errors pad in Visual Studio
+To get full build logs, set the log verbosity to diagnostic at the following locations:
+- On Visual Studio for Mac: Preferences > Projects > Build
+- On Visual Studio for Windows: Tools > Options > Projects and Solutions > Build and Run
+On Visual Studio for Windows you also want to add `-v -v -v -v` to the mtouch additional arguments by right-clicking the project in the solution explorer and selecting `Properties`.
+-->
+
+### Example Project (If Possible)
+
+<!--
+1. Place cursor below this comment block.
+2. Drag and drop the compressed project or files needed to reproduce.
+-->
+
+<!--
+Switch to the "Preview" tab to ensure your issue renders correctly.
+-->