Add jsonform.js

jsonform.js.md

@@ -0,0 +1,28 @@
+```javascript
+import { JsonForm, TextField, NumberField } from './jsonform.js';
+```
+
+## class JsonForm
+
+### constructor()
+
+### property editable
+
+### property model
+
+### property layout
+
+## class FormLayout
+
+This class can not be created, only accessed via `JsonForm.layout`.
+
+## class FormRow
+
+This class can not be created directly, only via `FormLayout.addRow()`.
+
+## class Field
+
+## class TextField
+
+## class NumberField
+