Added an issue template

ISSUE_TEMPLATE.md

@@ -0,0 +1,39 @@
+### Description
+
+<!-- a general description goes here -->
+
+### Code
+
+<!-- a snippet of code that demonstrates the issue -->
+
+### Expected Behavior
+
+<!-- a general description of what was the expected behavior or result -->
+
+### Actual Behavior
+
+<!-- a general description of what really happened -->
+
+### Basic Information
+
+- Version with issue:  <!-- the version of SkiaSharp that has the issue -->
+- Last known good version:  <!-- the version of SkiaSharp that still working -->
+- IDE:  <!-- Visual Studio / Visual Studio for Mac / MonoDevelop / Visual Studio Code -->
+- Platform Target Frameworks: <!-- all that apply, remove the platforms that aren't broken or haven't had any testing -->
+  - Android: <!-- the version of the Android SDK you are compiling against, e.g. 7.1 --> 
+  - iOS:  <!-- the version of the iOS SDK you are compiling against, e.g. 11.1 -->
+  - Linux:  <!-- The version and distro of linux that you are building for, e.g. Ubuntu 16.04 -->
+  - macOS:  <!-- The version of macOS you are building for, e.g. 10.10 -->
+  - Tizen:  <!-- the version of the Tizen SDK you are compiling against, e.g. 4.0 --> 
+  - tvOS:  <!-- the version of the tvOS SDK you are compiling against, e.g. 11.1 -->
+  - UWP:  <!-- the version of the UWP SDK you are compiling against, e.g. 16299 --> 
+  - watchOS:  <!-- the version of the watchOS SDK you are compiling against, e.g. 11.1 -->
+  - Windows Classic:  <!-- The version of Windows you are building for, e.g. Windows 7 -->
+
+### Screenshots
+
+<!-- if the issue is a visual issue, please include screenshots showing the problem if possible -->
+
+### Reproduction Link
+
+<!-- please upload or provide a link to a reproduction case -->