add issue template

.github/ISSUE_TEMPLATE/issue-template.md

@@ -0,0 +1,26 @@
+---
+name: Issue Template
+about: Create an issue to help us improve
+
+---
+
+**Description**
+Description of what the issue is about.
+
+**Expected behavior**
+What you expected to happen.
+
+**Current behavior**
+What happened.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Logs**
+Post logs here or paste them to [Ghostbin](https://ghostbin.com) and insert the link here.
+
+**Environment**
+ - Flutter doctor output
+
+**Other**
+Add any other context about the problem here.