Add TypeScriptReact syntax test file

tests/syntax-tests/highlighted/TypeScriptReact/app.tsx

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+import * as React from "react";
+import { HelloComponent } from "./hello";
+import { NameEditComponent } from "./nameEdit";
+
+export const App = () => {
+  const [name, setName] = React.useState("defaultUserName");
+  const [editingName, setEditingName] = React.useState("defaultUserName");
+
+  const loadUsername = () => {
+    setTimeout(() => {
+      setName("name from async call");
+      setEditingName("name from async call");
+    }, 500);
+  };
+
+  React.useEffect(() => {
+    loadUsername();
+  }, []);
+
+  const setUsernameState = () => {
+    setName(editingName);
+  };
+
+  return (
+    <>
+      <HelloComponent userName={name} />
+      <NameEditComponent
+        initialUserName={name}
+        editingName={editingName}
+        onNameUpdated={setUsernameState}
+        onEditingNameUpdated={setEditingName}
+      />
+    </>
+  );
+};

tests/syntax-tests/source/TypeScriptReact/LICENSE.md

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+The `app.tsx` file has been added from https://github.com/Lemoncode/react-typescript-samples under the following license: 
+
+```text
+The MIT License (MIT)
+
+Copyright (c) 2016 brauliodiez
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+```

tests/syntax-tests/source/TypeScriptReact/app.tsx

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+import * as React from "react";
+import { HelloComponent } from "./hello";
+import { NameEditComponent } from "./nameEdit";
+
+export const App = () => {
+  const [name, setName] = React.useState("defaultUserName");
+  const [editingName, setEditingName] = React.useState("defaultUserName");
+
+  const loadUsername = () => {
+    setTimeout(() => {
+      setName("name from async call");
+      setEditingName("name from async call");
+    }, 500);
+  };
+
+  React.useEffect(() => {
+    loadUsername();
+  }, []);
+
+  const setUsernameState = () => {
+    setName(editingName);
+  };
+
+  return (
+    <>
+      <HelloComponent userName={name} />
+      <NameEditComponent
+        initialUserName={name}
+        editingName={editingName}
+        onNameUpdated={setUsernameState}
+        onEditingNameUpdated={setEditingName}
+      />
+    </>
+  );
+};