Set up linting

Author: bhch

.babelrc

@@ -0,0 +1,6 @@
+{
+    "presets": [
+        "@babel/preset-env",
+        ["@babel/preset-react", {"absoluteRuntime": false}]
+    ]
+}

.eslintrc.json

@@ -0,0 +1,31 @@
+{
+    "env": {
+        "browser": true,
+        "es2021": true
+    },
+    "extends": [
+        "eslint:recommended",
+        "plugin:react/recommended"
+    ],
+    "parser": "@babel/eslint-parser",
+    "parserOptions": {
+        "ecmaFeatures": {
+            "jsx": true
+        },
+        "ecmaVersion": 12,
+        "sourceType": "module"
+    },
+    "plugins": [
+        "react"
+    ],
+    "rules": {
+        "react/prop-types": "off",
+        "no-prototype-builtins": "off",
+        "no-unused-vars": "warn",
+        "no-unreachable": "warn"
+    },
+    "globals": {
+        "React": "readonly",
+        "ReactDOM": "readonly"
+    }
+}