add code linting with eslint #8

.eslintrc.json

@@ -0,0 +1,25 @@
+{
+    "env": {
+        "browser": true,
+        "es6": true,
+        "node": true
+    },
+    "extends": "eslint:recommended",
+    "parserOptions": {
+        "sourceType": "module"
+    },
+    "rules": {
+        "indent": [
+            "error",
+            2
+        ],
+        "linebreak-style": [
+            "error",
+            "unix"
+        ],
+        "quotes": [
+            "error",
+            "single"
+        ]
+    }
+}

README.md

@@ -3,3 +3,6 @@ This is a tool to display past and future retreats and create an online booking
 
 # Using it
 Use `npm install` to install dependancies. Then use `npm start` to launch it. Next go to http://localhost:3000.
+
+# Test code linting
+Use `npm run pretest` to test project with ESLint

package.json

@@ -4,7 +4,8 @@
   "private": true,
   "scripts": {
     "start": "nodemon ./bin/www",
-    "web": "node ./bin/www"
+    "web": "node ./bin/www",
+    "pretest": "eslint --ignore-path .gitignore ."
   },
   "engines": {
     "node": ">=8.0"
@@ -31,6 +32,7 @@
     "stripe": "^4.17.1"
   },
   "devDependencies": {
+    "eslint": "^4.19.1",
     "nodemon": "1.17.3"
   }
-}
+}