create a coroutine kotlin code example

Example: kotlin coroutine builders

launch - Launches new coroutine without blocking
current thread and returns a reference to the coroutine
as a Job.
runBlocking - Runs new coroutine and blocks current
thread interruptible until its completion.
async - Creates new coroutine and returns its future
result as an implementation of Deferred.
withContext - Change a coroutine context for some
block.