added github issue templates

.github/ISSUE_TEMPLATE/BUG.md

@@ -0,0 +1,73 @@
+---
+name: I have found out bug in plugin.
+about: You are writing an Flutter application with this webview plugin but the application is crashing
+  or throws an exception, a plugin is buggy, or something looks wrong.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!-- Thank you for using Flutter Webview plugin!
+
+     If you are looking for support, please check out our documentation
+     or consider asking a question on Stack Overflow:
+      * https://flutter.dev/
+      * https://api.flutter.dev/
+      * https://stackoverflow.com/questions/tagged/flutter?sort=frequent
+
+     If you have found a bug or if our documentation doesn't have an answer
+     to what you're looking for, then fill our the template below. Please read
+     our guide to filing a bug first: https://flutter.dev/docs/resources/bug-reports
+-->
+
+## System info
+
+Issue occurs on: iOS / Android / both
+Plugin version: xxx
+Flutter doctor output:
+
+```
+paste it here...
+```
+
+## Steps to Reproduce
+
+<!--
+     Please tell us exactly how to reproduce the problem you are running into.
+
+     Please attach a small application (ideally just one main.dart file) that
+     reproduces the problem. You could use https://gist.github.com/ for this.
+
+     If the problem is with your application's rendering, then please attach
+     a screenshot and explain what the problem is.
+-->
+
+1. ...
+2. ...
+3. ...
+
+## Logs
+
+<!--
+      Run your application with `flutter run --verbose` and attach all the
+      log output below between the lines with the backticks. If there is an
+      exception, please see if the error message includes enough information
+      to explain how to solve the issue.
+-->
+
+```
+```
+
+<!--
+     Run `flutter analyze` and attach any output of that command below.
+     If there are any analysis errors, try resolving them before filing this issue.
+-->
+
+```
+```
+
+<!-- Finally, paste the output of running `flutter doctor -v` here. -->
+
+```
+```

.github/ISSUE_TEMPLATE/SUPPORT.md

@@ -0,0 +1,25 @@
+---
+name: I want help writing my application
+about: You have a question for how to achieve a particular effect, or you need help
+  with using a particular API.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!-- Thank you for using Flutter!
+
+     Please check out our documentation first:
+      * https://flutter.dev/
+      * https://api.flutter.dev/
+
+     If you can't find the answer there, please consider asking a question on
+     the Stack Overflow Web site:
+      * https://stackoverflow.com/questions/tagged/flutter?sort=frequent
+
+     Please don't file a GitHub issue for support requests. GitHub issues are
+     for tracking defects in the product. If you file a bug asking for help, we
+     will consider this a request for a documentation update.
+
+-->

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,46 @@
+---
+name: Feature request
+about: Suggest a new idea for Flutter webview plugin.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!-- Thank you for using Flutter!
+
+     If you are looking for support, please check out our documentation
+     or consider asking a question on Stack Overflow:
+      * https://flutter.dev/
+      * https://api.flutter.dev/
+      * https://stackoverflow.com/questions/tagged/flutter?sort=frequent
+
+     If you have found a bug or if our documentation doesn't have an answer
+     to what you're looking for, then fill our the template below. Please read
+     our guide to filing a bug first: https://flutter.dev/docs/resources/bug-reports
+-->
+
+## Use case
+
+<!--
+     Please tell us the problem you are running into that led to you wanting
+     a new feature.
+
+     Is your feature request related to a problem? Please give a clear and
+     concise description of what the problem is.
+
+     Describe alternative solutions you've considered. Is there a package
+     on pub.dev/flutter that already solves this?
+-->
+
+## Proposal
+
+<!--
+     Briefly but precisely describe what you would like Flutter to be able to do.
+
+     Consider attaching images showing what you are imagining.
+
+     Does this have to be provided by Flutter directly, or can it be provided
+     by a package on pub.dev/flutter? If so, maybe consider implementing and
+     publishing such a package rather than filing a bug.
+-->