chore: update github issue templates; add docs/troubleshooting (#16077)

* chore: update github issue templates; add docs/troubleshooting

* Operation -> Operating

* add labels automatically

* OSX -> macOS

* troubleshooting template re-write by Jeremy

Author: andrewseguin

.github/ISSUE_TEMPLATE/bug.md

@@ -1,21 +1,30 @@
 ---
-name: Bug
-about: Report a bug found in Angular Material, CDK or our docs
-
+name: Bug Report
+about: Report a bug found in Angular Material or the CDK
 ---
 
-#### What is the expected behavior?
+#### Reproduction
+
+Use StackBlitz to reproduce your issue: https://stackblitz.com/fork/components-issue
 
+Steps to reproduce:
+1. 
+2. 
+ 
+ 
+#### Expected Behavior
 
-#### What is the current behavior?
+What behavior were you expecting to see?
 
 
-#### What are the steps to reproduce?
-Providing a StackBlitz reproduction is the *best* way to share your issue. <br/>
-StackBlitz starter: https://goo.gl/wwnhMV<br/>
+#### Actual Behavior
 
+What behavior did you actually see?
 
-#### Which versions of Angular, Material, OS, TypeScript, browsers are affected?
 
+#### Environment
 
-#### Is there anything else we should know?
+- Angular:
+- CDK/Material:
+- Browser(s):
+- Operating System (e.g. Windows, macOS, Ubuntu): 

.github/ISSUE_TEMPLATE/docs.md

@@ -0,0 +1,14 @@
+---
+name: Documentation
+about: Suggest an improvement to our documentation at material.angular.io
+labels: docs
+---
+
+#### Documentation Feedback
+
+Provide a brief summary of what you would like to see changed in our 
+documentation at material.angular.io.
+
+Feel free to provide any suggestions of content or examples you’d like us to include.
+
+**Affected documentation page:** Insert a link to the affected page on material.angular.io

.github/ISSUE_TEMPLATE/feature.md

@@ -1,13 +1,13 @@
 ---
 name: Feature
-about: Propose a new feature for Angular Material or CDK
-
+about: Propose a new feature for Angular Material or the CDK
+labels: feature
 ---
+ 
+#### Feature Description
 
-#### Please describe the feature you would like to request.
-
-
-#### What is the use-case or motivation for this proposal?
+Provide a brief summary of the feature you would like to see.
 
+#### Use Case
 
-#### Is there anything else we should know?
+Describe the use case(s) that the proposed feature would enable.

.github/ISSUE_TEMPLATE/troubleshooting.md

@@ -0,0 +1,48 @@
+---
+name: Troubleshooting
+about: Request for help on an issue you are facing with Angular Material or the CDK
+labels: troubleshooting
+---
+
+<!--------
+
+The Angular team can't provide general troubleshooting help. However, the extended community of
+users can provide more help: 
+
+StackOverflow: https://stackoverflow.com/questions/tagged/angular-material2
+Gitter: https://gitter.im/angular/material2
+Google Groups: https://groups.google.com/forum/#!forum/angular-material2
+
+Issues should capture only bug reports and feature requests. However, we understand that 
+it is not always clear whether an issue is caused by a bug or incorrect usage of a feature/component.
+
+Most support requests will be automatically closed. If the answer is quickly obvious, though, we 
+might be able to provide a brief answer.
+
+-------->
+
+
+#### What are you trying to do?
+
+What are you trying to do?
+
+#### What troubleshooting steps have you tried?
+
+What are you seeing that does not match your expectations? 
+
+#### Reproduction
+
+We can only help if we can reproduce the problem ourselves. 
+
+Use StackBlitz to demonstrate what you are trying to do: https://stackblitz.com/fork/components-issue 
+
+Steps to reproduce:
+1. 
+2. 
+  
+#### Environment
+
+- Angular:
+- CDK/Material:
+- Browser(s):
+- Operating System (e.g. Windows, macOS, Ubuntu):