add docs

.github/bug_report.md

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+---
+name: Bug Report
+about: Create a report to help us improve
+labels: bug
+---
+
+**Describe the bug**
+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**
+Add any other context about the problem here.

.github/feature_request.md

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+---
+name: Feature Request
+about: Suggest an idea for this project
+labels: enhancement
+---
+
+**Describe the feature you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A brief description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

CONTRIBUTING.md

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+# Opening an Issue
+When initiating an issue, select a starting template: either Bug Report or Feature Improvement. If you're reporting a bug, ensure that you can demonstrate the bug through testing or a proof of concept. For suggesting a feature enhancement, name it with a clear problem description and verify that a similar request isn't already underway or completed. Be aware that not every issue might be considered necessary to fix, so be prepared to engage in discussions, answering any queries or comments others might have about the issue.

TODO.md

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-1. check debuging extension is installed. maybe note it in README.md
-2. debugging guide
-    - yarn relay debug
-    - attach to debugger process (relay and debug are separate processes)
-3. the rest of
-   https://github.com/iverJisty/social-tw-website/pull/2#event-9972484000

docs/local_development.md

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+# Local Development
+
+# Troubleshooting Tips
+* pull latest changes from master and `yarn install` and `yarn build`
+* install circom if you haven't already
+* run following command and set up Twitter API Key. By default, it's a invalid API key.
+    ```shell
+    cp packages/relay/.env_example packages/relay/.env
+    ```
+* you may start all daemons in one terminal window with `yarn start`, or start each daemon in a separate terminal window. If you start separately, it's easier to debug, since you don't need to restart hardhat node and redeploy contracts every time you change the code.
+
+## Use VSCode Debugger to Debug Relay
+With this configuration `.vscode/launch.json` in place, you can use VSCode debugger to debug relay.
+```json
+"version": "0.2.0",
+    "configurations": [
+        {
+            "type": "node",
+            "request": "attach",
+            "name": "Attach to backend process TS-Node",
+            "processId": "${command:PickProcess}",
+            "skipFiles": [
+                "<node_internals>/**"
+            ]
+        },
+    ],
+```
+
+![Select debug configuration](./images/AttachProcess.png)
+Select debug configuration
+![Attach to process](./images/AttachProcess2.png)
+attach to process
+![Set breakpoint](./images/SetBreakpoint.png)
+and set breakpoint.
+
+# Testing
+In the root directory, run:
+```shell
+yarn run test
+```
+or run tests for a specific package:
+```shell
+yarn run test --scope @unirep-app/relay
+```

docs/system_overview.md

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+# System Overview
+# Overview Diagram
+[login flow](https://drive.google.com/file/d/1gP4fVwX9vjOVqCKJ2XYUMBYEn0ngH0cG/view?usp=sharing)