added a quick readme

container-README.md

@@ -0,0 +1,50 @@
+# prezto docker container
+
+This branch contains a Dockerfile and a Makefile that hopefully may
+prove helpful for prezto development.
+
+The idea is to have a totally independendn and isolated environemnet
+in which to quickly make changes to either prezto-core or any plugin
+that may bein development, enabling automated testing and even
+continuous integration.
+
+The container is a basic install of alpine linux, so the image
+download is reasonably small
+
+On the container we have a few utilities and additionalsoftware that
+prezto has core support for
+
+you can  check it out in a snap by doing:
+
+docker pull hlecuanda/prezto-dev:latest
+
+once you have the image, create a container from it with:
+
+docker run -it --rm -h prezto hlecuanda/prezto-dev:latest
+
+that will set you on a prompt withing the container with a
+vanilla install of prezto.
+
+a development and testing run can be achieved by mounting the stuff
+you're working on to the image's filesystem:
+
+docker run -it --rm -h prezto \
+        -v /local/path:/home/prezto \
+        -v /local/path/zdotdir:/home/preztoa \
+        -v /local/module-dev-src:/home/prezto/.zprezto/modules/yourmodulea \
+        hlecuanda/prezto-dev:latest
+
+the third volume mapping is particularly interesting. you can
+develop on your own machine and environnmen, and when spinning up the
+container, your actual source is already in-plase asif installed on a
+vanilla prezto install.
+
+keep in mind that the container are ephemeral, unless you remove the
+--rm option which will create new containers each time you run the
+command, but the changes to the filesystemwill persist on a container
+file that you can later spin up again to re use.
+
+I have found epehermeral containers to be most useful since you get an
+untainted, pristine environment for testing every time you spin up the
+container.
+