Add template issue

.github/ISSUE_TEMPLATE/i-have-a-problem-with-rive-flutter.md

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+---
+name: I have a problem with rive-flutter
+about: Tell us what's wrong
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+<-- 
+Thanks for using Rive!
+
+If something isn't working like you expected, please:
+- Make sure you've updated to rive-flutter to the latest version:
+			https://pub.dev/packages/rive/versions
+- Check out our help center
+			https://help.rive.app/
+
+   If you found a bug or if you can't find what you're looking for 
+in our docs, fill out the template below.
+-->
+
+### Description
+<-- A clear and concise description of what the problem is. -->
+
+### Steps To Reproduce
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error ⚠️
+
+#### Source `.riv`/`.rev` file
+<-- 
+	Attaching the source `.riv` file that reproduces the issue is immensely helpful for our team to identify the problem as fast as possible and fix it.
+	If you can also attach the source (`.rev`) by [downloading a backup](https://help.rive.app/editor/exporting#for-backup) from the Editor, that will help us speed things up too.
+-->
+
+### Expected behavior
+<-- A clear and concise description of what you expected to happen. -->
+
+#### Screenshots
+<-- If applicable, add screenshots to help explain your problem. -->
+![Screenshot](url)
+
+### Device & Versions (please complete the following information)
+- Device: [e.g. Android Emulator, iOS Simulator] 
+- OS: [e.g. Android SDK API Level 30, iOS 14.5]
+- Flutter Version: Copy-paste the output of `flutter --version`
+	e.g.:
+	```
+	Flutter 2.2.2 • channel stable • https://github.com/flutter/flutter.git
+	Framework • revision d79295af24 (2 weeks ago) • 2021-06-11 08:56:01 -0700
+	Engine • revision 91c9fc8fe0
+	Tools • Dart 2.13.3
+	```
+
+#### Additional context
+<-- Add any other context about the problem here. -->