feat(Form): add a new all-in-one Form with single Input and Button

A new component that provides a Form wrapped around a single
Form.InputGroup and appended Button

src/forms/FormWithSingleInputAndButton.react.js

@@ -0,0 +1,32 @@
+// @flow
+
+import * as React from "react";
+import Form from "../components/Form/Form.react";
+import Button from "../components/Button/Button.react";
+import type { Props as FormProps } from "../components/Form/Form.react";
+import type { Props as FormInputProps } from "../components/Form/FormInput.react";
+import type { Props as ButtonProps } from "../components/Button/Button.react";
+
+type Props = {|
+  formProps?: FormProps,
+  inputProps?: FormInputProps,
+  buttonProps?: ButtonProps,
+|};
+
+/**
+ * A form containing a single input field with an appended Button
+ */
+function FormWithSingleInputAndButton({
+  formProps,
+  inputProps,
+  buttonProps,
+}: Props): React.Node {
+  const button = React.createElement(Button, buttonProps);
+  return (
+    <Form {...formProps}>
+      <Form.InputGroup inputProps={inputProps} append={button} />
+    </Form>
+  );
+}
+
+export default FormWithSingleInputAndButton;