Migrate react app to typescript

Installed the necessary dependencies and config files

reactapp/tsconfig.json

@@ -0,0 +1,25 @@
+{
+  "compilerOptions": {
+    "target": "es2016",
+    "lib": [
+      "dom",
+      "dom.iterable",
+      "esnext"
+    ],
+    "allowJs": true,
+    "skipLibCheck": true,
+    "allowSyntheticDefaultImports": true,
+    "strict": true,
+    "forceConsistentCasingInFileNames": true,
+    "module": "esnext",
+    "moduleResolution": "node",
+    "resolveJsonModule": true,
+    "noEmit": true,
+    "jsx": "react"
+  },
+  "include": [
+    "src",
+    "src/components",
+    "src/custom.d.ts"
+  ]
+}