Updated SDRangel server (markdown)

SDRangel-server.md

@@ -29,3 +29,8 @@ Supervisor is a Python package that makes it very easy to manage processes using
 * [Raspbian](https://github.com/f4exb/sdrangel/wiki/SDRangel-server-with-supervisor-in-Raspbian)
 * [Ubuntu](https://github.com/f4exb/sdrangel/wiki/SDRangel-server-with-supervisor-in-Ubuntu)
 
+# Program control via REST API
+
+You can use any program that can make HTTP requests like Python with the `request` package. There are a few examples of such Python scripts [here](https://github.com/f4exb/sdrangel/tree/master/swagger/sdrangel/examples)
+
+You can also use the [SDRangelcli](https://github.com/f4exb/sdrangelcli) web browser based UI.