Add a single field form example in the playground (rjsf-team#390)

Author: Julien Bouquillon

playground/samples/index.js

@@ -11,6 +11,7 @@ import large from "./large";
 import date from "./date";
 import validation from "./validation";
 import files from "./files";
+import single from "./single";
 
 export const samples = {
  Simple: simple,
@@ -26,4 +27,5 @@ export const samples = {
  "Date & time": date,
  Validation: validation,
  Files: files,
+ Single: single
 };

playground/samples/single.js

@@ -0,0 +1,7 @@
+module.exports = {
+ schema: {
+ title: "A single-field form",
+ type: "string",
+ },
+ formData: "initial value"
+};