add eslint configuration

Author: DaniAkash

.eslintrc.json

@@ -0,0 +1,27 @@
+{
+  "parser": "babel-eslint",
+  "env": {
+    "browser": true,
+    "commonjs": true,
+    "es6": true,
+    "node": true
+  },
+  "parserOptions": {
+    "ecmaFeatures": {
+      "jsx": true
+    },
+    "sourceType": "module"
+  },
+  "rules": {
+    "no-const-assign": "warn",
+    "no-this-before-super": "warn",
+    "no-undef": "warn",
+    "no-unreachable": "warn",
+    "no-unused-vars": "warn",
+    "constructor-super": "warn",
+    "valid-typeof": "warn",
+    "semi": "warn"
+  },
+  "plugins": [
+  ]
+}

.gitignore

@@ -1,6 +1,5 @@
 node_modules
-.eslintrc.json
 jsconfig.json
 yarn.lock
 .vscode
-npm-debug.log
+npm-debug.log