add viewDeck sh script

template/viewDeck.sh

-npm install -g npm@latest grunt-cli generator-reveal
-npm install
+# create symlinks to theme
+if [ ! -L "theme" ]; then
+    ln -s ../theme theme
+    echo "symbolic link to theme created"
+fi
+if [ ! -L "package.json" ]; then
+    ln -s ../theme/package.json package.json
+    echo "symbolic link to package.json of theme created"
+fi
+
+# install
+if [ ! -d "node_modules" ]; then
+    npm install -g npm@latest grunt-cli generator-reveal
+    npm install
+fi
+# serve
 grunt server