lean into examples

examples/exit/exit.sh

@@ -0,0 +1,13 @@
+#  If you run `exit.go` using `go run`, the exit
+# will be picked up by `go` and printed.
+$ go run exit.go
+exit status 3
+
+# By building and executing a binary you can see
+# the status in the terminal.
+$ go build exit.go
+$ ./exit
+$ echo $?
+3
+
+# Note that the `!` from our program never got printed.