Move DockerImage into Chipyard + Bump BOOM (#463)

* [ci] move docker image to chipyard [ci skip]

* [ci] bump with new image

* [boom] bump

.circleci/images/README.md

@@ -0,0 +1,18 @@
+General
+-------
+This DockerFile contains the necessary steps to build a Docker container that can run
+projects with riscv-tools, chisel3, firrtl, and verilator. It installs the necessary
+apt-get packages and sets the environment variables needed in CircleCI.
+
+Build and Deploy the Container
+------------------------------
+
+    sudo docker build . # to test build before building it with a tag
+    sudo docker build -t <PATH_NAME>:tag . # to build with tag (ex. 0.0.3)
+    sudo docker login # login into the account to push to
+    sudo docker push <PATH_NAME>:tag # to push to repo with tag
+
+Path Names
+----------
+Older docker images (when this Dockerfile was in `riscv-boom/riscv-boom`) can be found in the <PATH_NAME> `riscvboom/riscvboom-images`.
+Current up-to-date images are located in <PATH_NAME> `ucbbar/chipyard-image`