add(adapters,other): Grails Adapter & PingCRM (#28)

Author: matrei

README.md

@@ -84,6 +84,7 @@
 - [Rust](https://github.com/stuarth/inertia-rs)
 - [Oak (Deno)](https://github.com/jcs224/oak_inertia)
 - [Echo](https://github.com/kohkimakimoto/inertia-echo)
+- [Grails](https://github.com/matrei/grails-inertia-plugin)
 
 ## Resources
 
@@ -127,6 +128,7 @@
 - [Ping CRM / Flask](https://github.com/j0ack/pingcrm-flask) - Demonstration application made with Flask and Vue.js.
 - [Ping CRM / Echo](https://github.com/kohkimakimoto/pingcrm-echo) - Demonstration application made with Echo and Vue.js.
 - [Ping CRM / Preact](https://github.com/jrson83/pingcrm-preact) - Demonstration application made with Laravel Preact.
+- [Ping CRM / Grails](https://github.com/matrei/pingcrm-grails) - Demonstration application made with Grails and Vue.js.
 
 ### Other