Create PM2 Config file

I don't know if this is a good idea, but users that prefer to use PM2 instead, they can run `pm2 start` instead of `pm2 start server/server.js --name uptime-kuma` with this configuration

ecosystem.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+  apps: [{
+    name: "uptime-kuma",
+    script: "./server/server.js",
+  }]
+}