Add a basic React implementation of the map.

See client/README.md for instructions.

client/package.json

@@ -0,0 +1,52 @@
+{
+  "name": "client",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "@reduxjs/toolkit": "^1.7.2",
+    "@testing-library/jest-dom": "^4.2.4",
+    "@testing-library/react": "^9.5.0",
+    "@testing-library/user-event": "^7.2.1",
+    "@types/jest": "^24.9.1",
+    "@types/node": "^12.20.46",
+    "@types/react": "^16.14.23",
+    "@types/react-dom": "^16.9.14",
+    "@types/react-redux": "^7.1.22",
+    "axios": "^0.26.0",
+    "esri-leaflet": "^3.0.7",
+    "leaflet": "^1.7.1",
+    "milsymbol": "^2.0.0",
+    "react": "^17.0.2",
+    "react-dom": "^17.0.2",
+    "react-esri-leaflet": "^1.3.1",
+    "react-leaflet": "^3.2.5",
+    "react-redux": "^7.2.6",
+    "react-scripts": "5.0.0",
+    "typescript": "~4.1.5"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": "react-app"
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  },
+  "devDependencies": {
+    "@types/axios": "^0.14.0",
+    "@types/leaflet": "^1.7.9"
+  }
+}