Added readme for datastore samples

Author: jmdobry

datastore/README.md

@@ -0,0 +1,27 @@
+## Datastore Samples
+
+## Run a sample
+
+Install dependencies:
+
+```
+$ npm install
+```
+
+To print available commands:
+
+```
+$ npm run
+```
+
+Execute a sample:
+
+```
+$ npm run <sample> -- [arg_1] [arg_2] [arg_n]
+```
+
+Example:
+
+```
+$ npm run tasks -- list
+```