Added stesp to upgrade Airavata
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## Airavata Code Upgrade
+
+### Updating Airavata Codebase
+1. In order to update Airavata with latest master code; go to the folder (Created in installation; LocalAiravata) initially created to clone Airavata.
+2. Within your local folder navigate to folder 'airavata' and execute <pre><code>git pull </code></pre>
+Hint: If you are in the wrong folder you would probably get message <pre><code>'fatal: Not a git repository (or any of the parent directories): .git'</code></pre>
+3. Now build the code
+<pre><code> mvn clean install</code></pre>
+Hint: To avoid the 'tests on install' run <pre><code>mvn clean install -Dmaven.test.skip=true</code></pre>
+4. Once the build is success, stop the running Airavata server. You can either stop the java server using
+<pre><code>kill -9 <process ID></code></pre>
+OR<br>
+Navigate to bin folder where airavata server exists (LocalAiravata/apache-airavata-server-0.15-SNAPSHOT/bin). and stop the server
+<pre><code>./airavata-server.sh stop -force</code></pre>
+5. For references, back up the currently existing release
+<pre><code>mv apache-airavata-server-0.15-SNAPSHOT apache-airavata-server-0.15-SNAPSHOT-bk</code></pre>
+6. Copy the new release to your local folder (LocalAiravata)
+<pre><code>cp /<path to created folder>/LocalAiravata/airavata/distribution/target/apache-airavata-server-0.16-SNAPSHOT-bin.tar.gz .</code></pre>
+7. Un-tar the copied new release
+<pre><code>tar -xvf apache-airavata-server-0.16-SNAPSHOT-bin.tar.gz</code></pre>
+8. Navigate to the new bin folder and back up airavata-server.properties and gfac-config.yaml files.
+8. Copy your previously used airavata-server.properties from the backed up release to bin folder (This is the easiest way to get the properties file updated. If you prefer, you can change the new file manually. ☺)
+<pre><code>/<your local path>/LocalAiravata/LocalAiravata/apache-airavata-server-0.16-SNAPSHOT-bk/bin/airavata-server.properties .</code></pre>
+9. Copy your previously used gfac-config.yaml from the backed up release
+<pre><code>cp /<your local path>/LocalAiravata/apache-airavata-server-0.16-SNAPSHOT-bk/bin/gfac-config.yaml .</code></pre>
+10. Now compare with the new airavata-server.properties and gfac-config.yaml and make necessary changes in the copied files.
+11. Check the path correctness of credential store keystore in airavata-server.properties file.
+<pre><code>credential.store.keystore.url=/<your local path>/LocalAiravata/airavata_sym.jks</code></pre>
+12. Go to lib folder and copy mySQL jar (mysql-connector-java-5.1.38-bin.jar) from old backed up lib to the new lib
+<pre><code> cp /home/airavata/LocalAiravata/apache-airavata-server-0.16-SNAPSHOT-bk/lib/mysql-connector-java-5.1.38-bin.jar .</code></pre>
+13. Now restart airavata server in bin folder
+<pre><code>./airavata-server.sh start</code></pre>
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