Consider adding some brief docs for MrAnderson developers

Currently

While making some changes to MrAnderson, I was curious to know the best way to build and install locally.

I stumbled on the Makefile. And looked at what MrAnderson does for CircleCI.

And figured things out. Maybe.

I think...

Some dev docs would be helpful for those who want to contribute to MrAnderson.

This could either be in a separate dev.md doc or directly in the current README.md.

Also...

Even after looking at the Makefile several times, I'm not sure I understand how to build and install a version of MrAnderson with inlined deps to my local maven repo.

I tweaked the Makefile:

-.PHONY: install inline test integration-test deploy clean
+.PHONY: boostrap-install inline test integration-test install deploy clean

# Note that `install` is a two-step process: given that mranderson depends on itself as a plugin,
# it first needs to be installed without the plugin, for bootstrapping this self dependency.
-install:
+bootstrap-install:
    lein clean
    lein with-profile -user,-dev install
    lein with-profile -user,-dev,+mranderson-plugin install

-.inline: install
+.inline: bootstrap-install
    rm target/*.jar
    rm pom.xml
    lein with-profile -user,-dev,+mranderson-plugin inline-deps :skip-javaclass-repackage true
    touch .inline

inline: .inline

test:
    lein test

integration-test:
    .circleci/integration_test.sh

+install: .inline
+   lein with-profile -user,-dev,+mranderson-profile install
+
deploy: .inline
    lein with-profile -user,-dev,+mranderson-profile deploy clojars

clean:
    lein clean
    rm -rf .inline

This seemed to work, but if it does not make sense please let me know so I can better understand. If it does make sense I can include the change in the PR.

Next Steps

If adding some brief developer docs is something that interests you too, I'll follow up with a PR.

benedekfazekas / mranderson