meta: multiple issue templates (#4519)

* MOAR issue templates

* ...LESS issue templates

.github/ISSUE_TEMPLATE/Bug_report.md

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+---
+name: Bug report
+about: Report an issue you're experiencing
+
+---
+
+<!---
+Thanks for filing a bug report 😄 ! Before you submit, please read the following:
+
+If you're here to report a security issue, please STOP writing an issue and
+contact us at security@swagger.io instead!
+
+Search open/closed issues before submitting!
+
+Issues on GitHub are only related to problems of Swagger-UI itself. We'll try
+to offer support here for your use case, but we can't offer help with projects
+that use Swagger-UI indirectly, like Springfox or swagger-node.
+
+Likewise, we can't accept bugs in the Swagger/OpenAPIspecifications themselves,
+or anything that violates the specifications.
+
+-->
+
+## Q&A (please complete the following information)
+ - OS: [e.g. macOS]
+ - Browser: [e.g. chrome, safari]
+ - Version: [e.g. 22]
+ - Method of installation: [e.g. npm, dist assets]
+ - Swagger-UI version: [e.g. 3.10.0]
+ - Swagger/OpenAPI version: [e.g. Swagger 2.0, OpenAPI 3.0]
+
+### Content & configuration
+<!--
+  Provide us with a way to see what you're seeing,
+  so that we can fix your issue.
+-->
+
+Example Swagger/OpenAPI definition:
+```yaml
+# your YAML here
+```
+
+Swagger-UI configuration options:
+```js
+SwaggerUI({
+  // your config options here
+})
+```
+
+```
+?yourQueryStringConfig
+```
+
+### Describe the bug you're encountering
+<!-- A clear and concise description of what the bug is. -->
+
+### To reproduce...
+
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+### Expected behavior
+<!-- A clear and concise description of what you expected to happen. -->
+
+### Screenshots
+<!-- If applicable, add screenshots to help explain your problem. -->
+
+### Additional context or thoughts
+<!-- Add any other context about the problem here. -->

.github/ISSUE_TEMPLATE/Feature_request.md

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+---
+name: Feature request
+about: Suggest an new feature or enhancement for this project
+
+---
+
+## Q&A (please complete the following information)
+ - OS: [e.g. macOS]
+ - Browser: [e.g. chrome, safari]
+ - Version: [e.g. 22]
+ - Method of installation: [e.g. npm, dist assets]
+ - Swagger-UI version: [e.g. 3.10.0]
+ - Swagger/OpenAPI version: [e.g. Swagger 2.0, OpenAPI 3.0]
+
+ ### Content & configuration
+
+Swagger/OpenAPI definition:
+ ```yaml
+ # your YAML here
+ ```
+
+ Swagger-UI configuration options:
+ ```js
+ SwaggerUI({
+   // your config options here
+ })
+ ```
+
+ ```
+ ?yourQueryStringConfig
+ ```
+
+
+### Is your feature request related to a problem?
+<!--
+  Please provide a clear and concise description of what the problem is.
+  "I'm always frustrated when..."
+  -->
+
+### Describe the solution you'd like
+<!-- A clear and concise description of what you want to happen. -->
+
+### Describe alternatives you've considered
+<!--
+  A clear and concise description of any alternative solutions or features
+  you've considered.
+-->
+
+### Additional context
+<!-- Add any other context or screenshots about the feature request here. -->

.github/ISSUE_TEMPLATE/Support.md

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+---
+name: Support
+about: Ask a question or request help with your implementation.
+
+---
+
+<!--
+  We can only offer support for Swagger-UI itself.
+
+  If you're having a problem with a library that uses Swagger-UI
+  (for example, Springfox or swagger-node), please open an issue
+  in that project's repository instead.
+ -->
+
+### Q&A (please complete the following information)
+ - OS: [e.g. macOS]
+ - Browser: [e.g. chrome, safari]
+ - Version: [e.g. 22]
+ - Method of installation: [e.g. npm, dist assets]
+ - Swagger-UI version: [e.g. 3.10.0]
+ - Swagger/OpenAPI version: [e.g. Swagger 2.0, OpenAPI 3.0]
+
+### Content & configuration
+<!-- Provide us with a way to see what you're seeing, so that we can help. -->
+
+Swagger/OpenAPI definition:
+```yaml
+# your YAML here
+```
+
+Swagger-UI configuration options:
+```js
+SwaggerUI({
+  // your config options here
+})
+```
+
+```
+?yourQueryStringConfig
+```
+
+### Screenshots
+<!-- If applicable, add screenshots to help give context to your problem. -->
+
+### How can we help?
+<!-- Your question or problem goes here! -->