add some getting started instructions about macondo

[domino14]

Hey Martin, thanks for the issue - you’re right that I need a few more details. If you look at https://domino14.github.io/macondo, there are instructions there on building a gaddag with the make_gaddag executable.

Additionally, you can download the darwin release tarball, which comes with the NWL18 and CSW19 gaddags. Please let me know if this doesn’t work for you.

[martindemello]

i do not know enough go to figure out the invocation to make make_gaddag. i suggest you have a makefile that runs the right commands to build all the executables.

(on linux, so the darwin binaries won't help)

[martindemello]

nevermind, figured it out (i was expecting it to write the binary to the same place as main.go). i'll send in a PR with a Makefile.