[CI] Added docker setup

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+This is a shared directory between the docker container and the hosting machine.
+Edit the files at your convenience on the host machine and then compile and run
+from the container.
+
+To try the included code, do the following:
+
+Copy the `atoi.cl` file provided by the course materials
+(`/usr/class/cs143/assignments/PA1/atoi.cl`) in the same working directory as
+where you copy these three files and run them as follows:
+
+```
+$ # This runs the first implementation of factorial
+$ coolc factorial1.cl atoi.cl
+$ spim factorial1.s
+```
+
+The program waits for a number input and then outputs the factorial.
+
+```
+$ # This runs the second implementation of factorial
+$ coolc factorial2.cl atoi.cl
+$ spim factorial2.s
+```
+
+The UI is the same.
+
+```
+$ # This runs the program implementing a linked list
+$ coolc list.cl atoi.cl
+$ spim list.s
+```
+
+The program waits for no input, but prints "Hello World! 42".
+
+If `list.cl` is modified to uncomment the two lines that add the `abort`
+variable to the list, running the program will abort and not print anything.