chore: Refactor graphQL queries structure

packages/backend/src/graphql/queries/get-app.ts

@@ -1,11 +1,27 @@
+import { GraphQLString, GraphQLNonNull } from 'graphql';
 import App from '../../models/app';
+import appType from '../types/app';
 
-const getApp = (name: string) => {
-  if(!name) {
+type Params = {
+  name: string
+}
+
+const getAppResolver = (params: Params) => {
+  if(!params.name) {
     throw new Error('No name provided.')
   }
 
-  return App.findOneByName(name)
+  return App.findOneByName(params.name)
 }
 
+const getApp = {
+  type: appType,
+  args: {
+    name: { type: GraphQLNonNull(GraphQLString) },
+  },
+  resolve: (_: any, params: Params) => getAppResolver(params)
+}
+
+
+
 export default getApp;