docs(README): Updated README with simple usage instructions

Closes #1

.babelrc

@@ -6,10 +6,7 @@
       "env",
       {
         "targets": {
-          "browsers": [
-            "last 2 versions",
-            "ie >= 10"
-          ]
+          "browsers": [ "last 2 versions", "ie >= 10" ]
         }
       }
     ]

README.md

@@ -1,17 +1,44 @@
 # cronmatch
 
-`cronmatch` is a simple cron expression parser. It compares a provided date string or `Date` object with a cron expression to see if it matches.
+`Cronmatch` is a simple cron expression parser. It compares a provided date string or `Date` object with a cron expression to see if it matches.
 
 ## Installation
 
 For use in Node:
 ```
-npm install cronmatch
+npm install @paulsmith/cronmatch
 ```
 
 For use in the browser:
 ```
 <script src="https://unpkg.com/@paulsmith/cronmatch/dist/cronmatch.min.js"></script>
 ```
 
-## Usage
+## Usage
+
+```
+
+const cronmatch = require('cronmatch');
+
+var cronExpr = '*/2 * * * *'; // Every even minute
+var date1 = new Date('January 20, 2020 12:00:00');
+var date2 = new Date('January 20, 2020 12:01:00');
+
+cronmatch(cronExpr, date1);   // true
+cronmatch(cronExpr, date2);   // false
+
+```
+
+minute: [0, 59]
+hour: [0, 23]
+day: [1, 31]
+month: [1, 12]
+dayOfWeek: [0, 6]
+
+
+
+## Limitations
+
+* `cronmatch` does not yet understand 6-field cron expressions with seconds
+* It does not yet validate cron expressions
+* Does not yet support JAN-DEC for month or MON-SUN for dayOfWeek

src/index.js

@@ -1,9 +1,5 @@
 import getRange from './getRange';
 
-
-// const stepInterval = (expr) => {
-// };
-
 const fieldHit = (field) => {
   var range, step;
   var values = [];