Add an issue template to provide some framing for new issues. (#1801)

* Add an issue template to provide some framing for new issues.

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,56 @@
+<!--
+Use Markdown language for styling.
+Github's Markdown Guide https://guides.github.com/features/mastering-markdown/
+Please use the SEARCH function before opening a new issue!
+-->
+
+### --Issue Summary--
+<!-- A brief overview of your issue  -->
+
+### --Video or Image Reference--
+<!-- (Optional) A screenshot, short video, etc. to show your problem -->
+
+### --Steps to reproduce--
+<!-- Describe the steps to reproduce the problem, more steps are better. -->
+
+### --Actual Results--
+<!-- Explain what you actually got. -->
+
+### --Expected Results--
+<!-- Explain how the program should behave in the context you're using it. -->
+
+### --System Information--
++ OpenToonz Version:
+<!-- You can find the VERSION in Menu->Help->About OpenToonz -->
+
++ Operating System:
+<!-- (e.g., Windows10, macOS 10.12, Ubuntu 16.04, Debian Stretch) -->
+
+
++ Other Device Info (Optional):
+
+* RAM Size  4GB, 8GB, 16GB:
+
+* Graphics Tablet:
+<!-- (Optional) (Write your MODEL, e.g., WACOM Intuos 2) -->
+
+
+
+---
+<!--
+### --For Code Contributors--
+(Optional) Use this space to point to relevant code chunks that might be causing the issue.
+
+```C++
+    Paste here code snippets relevant to your report like so:
+    #include <iostream>
+
+    int main() {
+        std::cout << "Hello, World" << endl;        
+        return 0;
+    }
+
+```
+-->
+
+