added yourls a bitly alternative

yourls/README.md

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+Bit.ly alternative
+https://yourls.org/
+
+This is not a full tutorial but more of a reference.
+
+### Minimum File Structure
+```
+/home/
+└── ~/
+    └── docker/
+        └── yourls/
+            ├── docker-compose.yml
+```
+### Add to Caddyfile (from ~/docker/caddy)
+Remember to `docker exec -w /etc/caddy caddy caddy reload` after editing your Caddyfile.
+
+```
+urls.YOURDOMAIN.com {
+		reverse_proxy yourls:80
+}
+```
+
+### docker-compose.yml
+Change YOURDATABASEPASSWORD in 2 lines and change YOURADMINUSERPASSWORD in one line from the yml below.
+
+```
+version: '3.1'
+
+services:
+  yourls:
+    image: yourls
+    container_name: yourls
+    restart: unless-stopped
+#    ports:
+#      - 8080:80
+    environment:
+      YOURLS_DB_HOST: yourls-db
+      YOURLS_DB_PASS: YOURDATABASEPASSWORD
+      YOURLS_PRIVATE: "true"
+      YOURLS_SITE: https://urls.YOURDOMAIN.com
+      YOURLS_USER: yourls
+      YOURLS_PASS: YOURADMINUSERPASSWORD
+
+  mysql:
+    image: mysql
+    container_name: yourls-db
+    restart: unless-stopped
+    environment:
+      MYSQL_ROOT_PASSWORD: YOURDATABASEPASSWORD
+      MYSQL_DATABASE: yourls
+
+networks:
+  default:
+    external:
+      name: caddy_net
+
+```