Add README

README.md

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+# EH Downloader
+
+## How to start server
+
+### One Time Setup
+
+```powershell
+git clone "https://github.com/lifegpc/eh-downloader.git"
+cd eh-downloader
+# Fetch static files from node_modules. These files are used in frontend.
+deno task fetch
+```
+
+### Start Server
+
+```powershell
+# Optional. This will enable release mode for fresh.
+$env:DENO_DEPLOYMENT_ID="$(git rev-parse HEAD)"
+# Optional. Prebuild islands.
+deno task server-build
+# Start server
+deno task server
+```
+
+Now dashboard is available at `http://localhost:8000/`.
+
+## other frontend
+
+- [Flutter frontend](https://github.com/lifegpc/eh_downloader_flutter)