move installation docs under separate dir

doc/install/databases.md

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+# Databases:
+
+GitLab use mysql as default database but you are free to use PostgreSQL or SQLite.
+
+
+## SQLite
+
+    sudo apt-get install -y sqlite3 libsqlite3-dev 
+
+## MySQL
+
+    sudo apt-get install -y mysql-server mysql-client libmysqlclient-dev
+
+    # Login to MySQL
+    $ mysql -u root -p
+
+    # Create the GitLab production database
+    mysql> CREATE DATABASE IF NOT EXISTS `gitlabhq_production` DEFAULT CHARACTER SET `utf8` COLLATE `utf8_unicode_ci`;
+
+    # Create the MySQL User change $password to a real password
+    mysql> CREATE USER 'gitlab'@'localhost' IDENTIFIED BY '$password';
+
+    # Grant proper permissions to the MySQL User
+    mysql> GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, INDEX, ALTER ON `gitlabhq_production`.* TO 'gitlab'@'localhost';
+
+
+## PostgreSQL
+
+    sudo apt-get install -y postgresql-9.2 postgresql-server-dev-9.2
+
+    # Connect to database server
+    sudo -u postgres psql -d template1
+
+    # Add a user called gitlab. Change $password to a real password
+    template1=# CREATE USER gitlab WITH PASSWORD '$password';
+
+    # Create the GitLab production database
+    template1=# CREATE DATABASE IF NOT EXISTS gitlabhq_production;
+
+    # Grant all privileges on database
+    template1=# GRANT ALL PRIVILEGES ON DATABASE gitlabhq_production to gitlab;
+
+    # Quit from PostgreSQL server
+    template1=# \q
+
+    # Try connect to new database
+    $ su - gitlab
+    $ psql -d gitlabhq_production -U gitlab
+
+
+
+#### Select the database you want to use
+
+    # SQLite
+    sudo -u gitlab cp config/database.yml.sqlite config/database.yml
+
+    # Mysql
+    sudo -u gitlab cp config/database.yml.mysql config/database.yml
+
+    # PostgreSQL
+    sudo -u gitlab cp config/database.yml.postgres config/database.yml
+
+    # make sure to update username/password in config/database.yml
+
+#### Install gems 
+
+    # mysql
+    sudo -u gitlab -H bundle install --without development test sqlite postgres  --deployment
+
+    # or postgres
+    sudo -u gitlab -H bundle install --without development test sqlite mysql --deployment
+
+    # or sqlite
+    sudo -u gitlab -H bundle install --without development test mysql postgres  --deployment
+