Docs: Setup the Camli build on a Mac

Change-Id: Idb334589314983e0d9f0d6ecedc64469aa303ede

doc/setup.txt

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+===
+Instructions for getting the Camlistore build to work on Mac OS X.
+
+* Install binaries
+  - Mercurial: http://mercurial.selenic.com/downloads/
+  - Git: http://code.google.com/p/git-osx-installer/downloads
+  - MySQL: http://dev.mysql.com/downloads/mysql/
+      echo 'export PATH=$PATH:/usr/local/mysql/bin' >> ~/.bash_profile
+      mysqladmin -u root password root
+
+* Setup Go
+  - Get the code: hg clone -u release https://go.googlecode.com/hg/ ~/go
+  - Build it:
+      cd ~/go/src; ./all.bash
+  - Fix your environment:
+      echo 'export GOROOT=/Users/$USER/go/' >> ~/.bash_profile
+      echo 'export PATH=/Users/$USER/go/bin:$PATH' >> ~/.bash_profile
+
+* Setup Camlistore
+  - Get the code: git clone https://camlistore.org/r/p/camlistore ~/camlistore
+  - Run it:
+      cd ~/camlistore; ./dev-server
+  - Upload a file (make sure this works):
+      ~/camlistore/dev-camput file ~/camlistore/COPYING
+  - Create a permanode (which needs GPG keys):
+      ~/camlistore/dev-camput permanode
+  - Use the UI: http://localhost:3179/ui/
+
+* App Engine for Go
+  - Get the dev_appserver: http://code.google.com/p/googleappengine/downloads/list
+  - Run it:
+      ~/google_appengine/dev_appserver.py -a `hostname` --high_replication server/go/appengine/
+  - Uplaod a file:
+      ./dev-camput --blobserver=localhost:8080/bs --password=foo file COPYING
+
+* Hack on it
+  - TextMate bundle: https://github.com/AlanQuatermain/go-tmbundle
+      - Go to Preferences -> Advanced -> Folder References -> File Pattern
+      - Add: "|_go_\.6" without quotes before the $ to prevent the object files from creeping in
+  - Learn how to contribute: http://camlistore.org/docs/contributing