updated readme

Author: Dabit

README.md

@@ -34,5 +34,115 @@ amplify update api
 amplify update auth
 
 amplify update function
-``
+```
+
+### Updating / evolving the GraphQL schema
+
+To update the schema, open the schema at *amplify/backend/api/jamstackcms*. Here is the base schema:
+
+```graphql
+  
+type Post @model
+  @auth (
+      rules: [
+          { allow: groups, groups: ["Admin"], operations: [create, update, delete] },
+          { allow: private, operations: [read] },
+          { allow: public, operations: [read] }
+      ]
+  ) {
+  id: ID!
+  title: String!
+  description: String
+  content: String!
+  cover_image: String
+  createdAt: String
+  published: Boolean
+  previewEnabled: Boolean
+  categories: [String]
+  author: User @connection
+}
+
+type Comment @model @auth(
+  rules: [
+    { allow: groups, groups: ["Admin"], operations: [create, update, delete] },
+    { allow: owner, ownerField: "createdBy", operations: [create, update, delete] }
+  ]
+) {
+  id: ID!
+  message: String!
+  createdBy: String
+  createdAt: String
+}
+
+type Settings @model @auth(rules: [
+    { allow: groups, groups: ["Admin"] },
+    { allow: groups, groupsField: "adminGroups"},
+    { allow: public, operations: [read] },
+  ]) {
+  id: ID!  
+  categories: [String]
+  adminGroups: [String]
+  theme: String
+  border: String
+  borderWidth: Int
+  description: String
+}
+
+type Preview @model
+  @auth (
+      rules: [
+        { allow: groups, groups: ["Admin"] },
+        { allow: private, operations: [read] }
+      ]
+  ) {
+  id: ID!
+  title: String!
+  description: String
+  content: String!
+  cover_image: String
+  createdAt: String
+  categories: [String]
+}
+
+type Page @model(subscriptions: null)
+  @auth (
+      rules: [
+        { allow: groups, groups: ["Admin"] },
+        { allow: private, operations: [read] },
+        { allow: public, operations: [read] }
+      ]
+  )
+{
+  id: ID!
+  name: String!
+  slug: String!
+  content: String!
+  components: String
+  published: Boolean
+}
+
+type User @model
+  @auth(rules: [
+    { allow: owner },
+    { allow: groups, groups: ["Admin"]},
+    { allow: public, operations: [read] }
+  ])
+{
+  id: ID!
+  name: String
+  username: String
+  avatarUrl: String
+}
+```
 
+Once you've made the updates, run the following command to test the new API:
+
+```sh
+amplify mock
+```
+
+Once you've tested the updates, run the following command to deploy the new API:
+
+```sh
+amplify push
+```