Created Installation (markdown)

Installation.md

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+## Manual Installation
+
+### Docker
+
+```bash
+# Create a volume
+docker volume create uptime-kuma
+
+# Start the container
+docker run -d --restart=always -p 3001:3001 -v uptime-kuma:/app/data --name uptime-kuma louislam/uptime-kuma:1
+```
+
+Browse to http://localhost:3001 after started.
+
+Change Port and Volume
+
+```bash
+docker run -d --restart=always -p <YOUR_PORT>:3001 -v <YOUR_DIR OR VOLUME>:/app/data --name uptime-kuma louislam/uptime-kuma:1
+```
+
+### Without Docker (x86/x64 only)
+
+Required Tools: Node.js >= 14, git and pm2.
+
+(**Not recommanded for ARM CPU users.** Since there is no prebuilt for node-sqlite3, it is hard to get it running)
+
+```bash
+git clone https://github.com/louislam/uptime-kuma.git
+cd uptime-kuma
+npm run setup
+
+# Option 1. Try it
+npm run start-server
+
+# (Recommended)
+# Option 2. Run in background using PM2
+# Install PM2 if you don't have: npm install pm2 -g
+pm2 start npm --name uptime-kuma -- run start-server
+
+# Listen to different port or hostname
+pm2 start npm --name uptime-kuma -- run start-server -- --port=80 --hostname=0.0.0.0
+
+```
+
+More useful commands if you have installed.
+
+```bash
+pm2 start uptime-kuma
+pm2 restart uptime-kuma
+pm2 stop uptime-kuma
+```
+
+Browse to http://localhost:3001 after started.
+
+### (Optional) One more step for Reverse Proxy
+
+This is optional for someone who want to do reverse proxy.
+
+Unlikely other web apps, Uptime Kuma is based on WebSocket. You need two more headers **"Upgrade"** and **"Connection"** in order to reverse proxy WebSocket.
+
+Please read wiki for more info:
+https://github.com/louislam/uptime-kuma/wiki/Reverse-Proxy