chore(github): update issue templates (#570)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,53 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: '[BUG]'
+labels: ''
+assignees: ''
+---
+
+Please note your issue will be closed without comment if do not fill out the issue checklist and provide ALL the requested information.
+
+**`yarn why http-proxy-middleware` OR `npm ls http-proxy-middleware` output (mask private folder names with \*\*\*\*\*)**
+
+```shell
+# paste output here
+```
+
+**Please verify that you've followed these steps**
+
+[ ] - I've updated to latest `http-proxy-middleware`.
+
+**Describe the bug**
+
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+
+If possible, please provide minimal example on CodeSandbox that demonstrates the issue. You can use the following template: https://codesandbox.io/s/http-proxy-middleware-44oc1
+
+**Step-by-step reproduction instructions**
+
+```text
+1. ...
+2. ...
+```
+
+**Expected behavior**
+
+A clear and concise description of what you expected to happen.
+
+**`http-proxy-middleware` configuration**
+
+```javascript
+// paste code and configuration here
+```
+
+**Server (please complete the following information):**
+
+- OS: [e.g. MacOS, Windows]
+- NodeJS version: [e.g. 12.4]
+
+**Additional context**
+
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: '[FEATURE]'
+labels: ''
+assignees: ''
+---
+
+**Describe the feature you'd love to see**
+
+A clear and concise description of the feature request
+
+**Additional context**
+
+Add any other context about the feature request here.