add gotify

gotify/README.md

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+gotify
+======
+
+[Gotify][1] is a simple server for sending and receiving messages.
+
+![](https://gotify.net/img/intro.png)
+
+```bash
+# server
+$ docker-compose up -d
+$ curl http://localhost:8080
+
+# client
+$ wget -O gotify https://github.com/gotify/cli/releases/download/v2.2.0/gotify-cli-linux-amd64
+$ chmod +x gotify
+$ gotify init
+$ gotify push -t "my title" -p 10 "my message"
+```
+
+[1]: https://gotify.net/

gotify/docker-compose.yml

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+version: "3.8"
+services:
+  gotify:
+    image: gotify/server
+    ports:
+      - "8080:80"
+    volumes:
+      - ./data:/app/data
+    environment:
+      - GOTIFY_DEFAULTUSER_NAME=admin
+      - GOTIFY_DEFAULTUSER_PASS=secret
+    restart: unless-stopped