improve README to include installation guide

Author: Worapol

Diff for: README.md

@@ -59,4 +59,17 @@ for i in "${!KCONNECT_NODES[@]}"; do
         }
     }'
 done
-```
+```
+
+#### Installation Guide
+
+1. Firstly build the package using the following command `mvn package`
+2. After building the package a new jar will created in `target/connect-fieldandtime-partitioner-1.1.0-SNAPSHOT.jar` copy the jar file into the s3 plugin directory
+3. Restart the connector if you use helm redeploy the helm so that it can detect the plugin
+
+__Tips__
+
+Where is the plugin?
+
+If the plugin was installed via confluent-hub the jar file should be copy to `/usr/share/confluent-hub-components/confluentinc-kafka-connect-s3/lib/` however if kafka-connect-s3-sink was installed somewhere else place the jar file in the same directly as the connector plugin jars.
+