Describe client libs examples in README.md (#6)

Author: asurkov

README.md

@@ -1,2 +1,54 @@
-# vacuum-analytics
-client libs for elasticsearch/logstash
+# Vacuum Analytics
+A lightweight logging solution based on elasticsearch/logstash.
+
+# Client libraries
+
+## Javascript library
+
+JavaScript library is designed to be used both in ```node``` and in browser apps.
+
+### Node logging
+
+Add dependncy into your app's package.json file:
+```
+"dependencies": {
+  "va": "file:<path_to_repo>/js/library",
+}
+```
+
+and then import library class into your app.js file:
+
+```
+const LogEvent = require('va').LogEvent;
+```
+
+See [example](https://github.com/sourcerer-io/vacuum-analytics/tree/master/js/samples/node) for how-to.
+
+### In-browser logging
+
+Copy ```<path_to_repo>/js/library``` and then include the script into your web app:
+
+```
+<script src='js/library/LogEvent.js'</script>
+```
+
+Refer to [example](https://github.com/sourcerer-io/vacuum-analytics/tree/master/js/samples/browser) for complete steps.
+
+## Kotlin library
+
+### Prerequirements
+* Install [Java SE](http://www.oracle.com/technetwork/java/javase/downloads/index.html)
+* Install [gradle](https://gradle.org/install/)
+
+### Build
+
+To build the [libarary](https://github.com/sourcerer-io/vacuum-analytics/tree/master/kotlin/libarary) and its [example](https://github.com/sourcerer-io/vacuum-analytics/tree/master/kotlin/sample):
+
+```
+cd kotlin && gradle build;
+```
+
+You can run the example by:
+```
+cd sample && gradle run;
+```