Update containers_examples.lua

add docs for containers

containers_examples.lua

@@ -0,0 +1,10 @@
+local containers = require("containers")
+
+
+--To create a container use the getENV(fspath, has_http) function
+--the first argument is the path for the file system the second is an optional argument that when provided with true enables http
+local env = containers.getENV("/containerfs")
+
+--To run the created container you call the start(env)
+--This will start the container and block on it you can put this in a function like parrallel.waitForAll()
+containers.start(env)