Created 🆙 How to Update (markdown)

🆙-How-to-Update.md

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+### 🆙🐳 Docker
+
+Re-pull the latest docker image and create another container with the same volume.
+
+For someone who used my "How-to-use" commands to install Uptime Kuma, you can update by this:
+
+```bash
+docker pull louislam/uptime-kuma:1
+docker stop uptime-kuma
+docker rm uptime-kuma
+docker run -d --restart=always -p 3001:3001 -v uptime-kuma:/app/data --name uptime-kuma louislam/uptime-kuma:1
+```
+
+PS: For every new release, it takes some time to build the docker image, please be patient if it is not available yet.
+
+### 🆙 💪🏻 Without Docker
+
+```bash
+cd <uptime-kuma-directory>
+git fetch --all
+git checkout 1.2.0 --force
+npm install
+npm run build
+pm2 restart uptime-kuma
+```