[docs] Add examples README

Author: elgopher

examples/README.md

@@ -0,0 +1,10 @@
+# Run example locally
+
+* cd into directory, for example `cd hello`
+* `go run .`
+
+# Run example without cloning the Pi source code
+
+* `go run github.com/elgopher/pi/examples/hello@latest`
+
+where `hello` is a directory name