add eslint files

client/.eslintrc.json

@@ -0,0 +1,46 @@
+{
+    "env": {
+        "node": true,
+        "browser": true,
+        "es2021": true
+    },
+    "extends": [
+        "eslint:recommended",
+        "plugin:react/recommended"
+    ],
+    "parserOptions": {
+        "ecmaVersion": "latest",
+        "sourceType": "module"
+    },
+    "plugins": [
+        "react",
+        "react-hooks"
+    ],
+    "rules": {
+        "indent": [
+            "error",
+            "tab"
+        ],
+        "linebreak-style": [
+            "error",
+            "windows"
+        ],
+        "quotes": [
+            "error",
+            "single"
+        ],
+        "semi": [
+            "error",
+            "always"
+        ],
+        "react/react-in-jsx-scope": "off",
+        "react/display-name": "off",
+        "react/prop-types": "off",
+        "react-hooks/exhaustive-deps": "error",
+        "object-curly-spacing": ["error", "always"],
+        "no-unused-vars": "error", 
+        "arrow-spacing": ["error", { "before": true, "after": true }],
+        "no-duplicate-imports": "error", 
+        "prefer-const": "error"
+    }
+}