add readme

Author: kmelve

README.md

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+# How to use Netlify Form and Functions to submit data to Sanity.io
+
+This is a simple example of how you can use Forms and Functions in [Netlify](https://netlify.com) to submit data to your Sanity.io project.
+
+## How to use
+
+1. Fork or clone this repo
+2. Run `yarn` or `npm install`
+3. Change the `projectId` and the `dataset` configuration in `/lambda/submission-created.js` to your Sanity.io project`s
+4. Commit and push the changes to your GitHub repo
+5. Connect Netlify to that repo, and add a environment variable in Netlify called `SANITY_TOKEN`
+6. Go to your Settings -> API in your project at [manage.sanity.io](https://manage.sanity.io), and add a token with `write` rights.
+7. Paste this token as the value for `SANITY_TOKEN` (be careful with where you store this token!)
+8. Submissions will be stored as the `_type: "submission.form"`, and will not be available through the public API without a token with `read` rights.
+9. If you want to view the submissions in the Studio, you can add the following schema to your project:
+
+```js
+/*
+ * Doesn't cover all the data fields.
+ * Remove or sest readOnly to `false` if you want to be able
+ * to edit the responses in the Studio
+ */
+
+export default {
+  name: 'submission.form',
+  type: 'document',
+  title: 'Form submission',
+  readOnly: true,
+  fields: [
+    {
+      name: 'title',
+      type: 'string',
+      title: 'Title'
+    },
+    {
+      name: 'number',
+      type: 'number',
+      title: 'Number'
+    },
+    {
+      name: 'created_at',
+      type: 'datetime',
+      title: 'Created at'
+    },
+    {
+      name: 'data',
+      type: 'object',
+      title: 'Data',
+      fields: [
+        {
+          name: 'email',
+          type: 'email',
+          title: 'Email'
+        },
+        {
+          name: 'name',
+          type: 'string',
+          title: 'Name'
+        },
+        {
+          name: 'message',
+          type: 'text',
+          title: 'Message'
+        },
+        {
+          name: 'role',
+          type: 'array',
+          title: 'Role',
+          of: [{ type: 'string' }]
+        }
+      ]
+    }
+  ]
+}
+
+```