Update readme file

README.md

@@ -1,3 +1,70 @@
 [![Build Status](https://travis-ci.org/maksimovicdanijel/vue-countdown.svg?branch=master)](https://travis-ci.org/maksimovicdanijel/vue-countdown)
 [![Coverage Status](https://coveralls.io/repos/github/maksimovicdanijel/vue-countdown/badge.svg?branch=development)](https://coveralls.io/github/maksimovicdanijel/vue-countdown?branch=development)
-VueJS countdown component
+
+## Countdown component for VueJS
+
+Component that creates countdown based on provided number of seconds or date in future. Install it by running:
+
+```
+npm install @dmaksimovic/vue-countdown --save
+```
+### Example usage
+
+Component.vue
+```
+<template>
+    <div>
+        <vue-countdown v-on:time-expire="handleTimeExpire" :seconds="10"></vue-countdown>
+    </div>
+</template>
+
+<script>
+import VueCountdown from '@dmaksimovic/vue-countdown';
+
+export default {
+    name: 'my-component',
+    components: {
+        'vue-countdown': VueCountdown
+    },
+    methods () {
+        handleTimeExpire () {
+            alert('Time is up!');
+        }
+    }
+}
+
+</script>
+```
+This will create a simple component that will output countdown that starts from 10 and counts until 0.
+
+### Options
+
+**seconds** - number of seconds to start counter from (type number)
+
+**date** - date in future as a string. Any string that can be parsed by Date.parse() is considered valid. Takes precedence over seconds parameter
+
+**message** - message to display when counter finishes
+
+**units** - array that represents units which will form the counter. Possible values are 'hours', 'minutes', 'seconds'
+
+### Events
+
+**time-expire** - triggered when timer finishes
+
+### Contributing
+
+**Building**
+
+```
+npm run build
+```
+
+**Testing**
+
+```
+npm test
+```
+
+### Licence
+
+[MIT](https://github.com/maksimovicdanijel/vue-countdown/blob/master/LICENSE)