Added following snippits about Asterisk

* A Basic Asterisk server for internal calling with IVR, curl triggers and message playback
* A Asterisk server to act as a bridge between a Bluetooth phone (as in/out bound route)
* A Node-Red Subflow to create a call between extensions using ARI

NodeRed/Readme.md

@@ -0,0 +1,4 @@
+# NodeRed Snippits
+## List of Flows
+## List of SubFlows
+* **ARI_caller** Uses the Asterisk REST API to generate a call between two extensions