Add issue and PR templates

.github/CONTRIBUTING.md

@@ -1,7 +1,19 @@
-# Contributing to Swagger Editor
+### Frequent Issues
 
-### Issues
-File issues in GitHub's to report bugs or issue a pull request.
+**Generated code is not working.**
+Report it in [Swagger Codegen](https://github.com/swagger-api/swagger-codegen) repository
+
+**I see "Code Generation Server is not availabe"**
+Either codegen servers are down or [your config](https://github.com/swagger-api/swagger-editor/blob/6dd09e5886c414801fd6eea3bb86bd2a3643c249/config/defaults.json.guide.js#L31) is pointing to an invalid loccation
+
+**`OPTIONS` call is failing**
+See [CORS document](https://github.com/swagger-api/swagger-editor/blob/master/docs/cors.md)
+
+**How do I store my spec?**
+Swagger Editor does not have a backend.
+
+**I can't start Swagger Editor**
+You rarely would need to build Swagger Editor from source. Use one of methods described in README to start a new instance of Swagger Editor.
 
 ### Licensing
 All contributions must grant copyright permission to this project, the source of which is declared to be under an Apache 2 license (see [LICENSE](./LICENSE)).

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,13 @@
+**Note on code generation issues**
+Please open an issue in [Swagger Codegen](https://github.com/swagger-api/swagger-codegen) repository for any issue with generating code or issues with generated codes.
+
+**My Swagger**
+
+```yaml
+ # paste your swagger document here
+```
+
+* Swagger Editor version(from Help > About menu): 
+* My browser: 
+
+**Issue**

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,7 @@
+**UI changes screenshots**
+<Please provide screenshot of UI changes in this pull request>
+
+**Browsers I manually tested this feature in**
+* [ ] Google Chrome
+* [ ] Firefox
+* [ ] Microsoft Edge