Add the assignment to write a hello-world program

[refs #61aa1809f705]

Author: jfahrer

developing/examples/hello-world/assignment1.md

@@ -0,0 +1,10 @@
+## Write your own hello-world program
+* Pick a language of your choice
+* Find an image in the Docker Store
+* Write the source code
+* Add a Dockerfile
+  * Set the working directory (WORKDIR)
+  * Copy the source code (COPY)
+  * Compile it if necessary (RUN)
+  * Execute the program (CMD)
+* Build the image and run it