Implemented ESlint and passed down the rules

api/package.json

@@ -40,5 +40,34 @@
         "mysql": "^2.18.1",
         "nodemailer": "^6.4.17",
         "uuid": "^8.2.0"
+    },
+    "devDependencies": {
+        "babel-eslint": "^10.1.0",
+        "eslint": "^7.18.0",
+        "eslint-plugin-import": "^2.22.1"
+    },
+    "eslintConfig": {
+        "env": {
+            "es6": true,
+            "browser": true
+        },
+        "parser": "babel-eslint",
+        "rules": {
+            "accessor-pairs": "warn",
+            "array-callback-return": "error",
+            "brace-style": "warn",
+            "consistent-return": "error",
+            "default-case": "error",
+            "eqeqeq": "warn",
+            "no-case-declarations": "error",
+            "no-empty-pattern": "warn",
+            "no-fallthrough": "error",
+            "no-unused-vars": "error",
+            "no-useless-catch": "error",
+            "no-var": "error",
+            "semi": "warn",
+            "no-extra-semi": "error",
+            "yoda": "warn"
+        }
     }
-}
+}