Added prepare release script

Author: Nutomic

prepare-release.bash

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+set -e
+
+NEW_VERSION_NAME=$1
+OLD_VERSION_NAME=$(grep " version =" "build.gradle" | awk '{print $3}' | tr -d "\"")
+if [[ -z ${NEW_VERSION_NAME} ]]
+then
+    echo "New version name is empty. Please set a new version. Current version: $OLD_VERSION_NAME"
+    exit
+fi
+
+echo "
+
+Updating Version
+-----------------------------
+"
+sed -i "s/version = \"$OLD_VERSION_NAME\"/version = \"$NEW_VERSION_NAME\"/" "build.gradle"
+
+git add "build.gradle"
+git commit -m "Version $NEW_VERSION_NAME"
+git tag ${NEW_VERSION_NAME}
+
+echo "
+Update ready.
+"