README: Add usage information

Describe how to add this custom repository as a local MacPorts source.
Based on this tutorial:

https://trac.macports.org/wiki/howto/SyncingWithGit

1 files changed, 18 insertions, 0 deletions

diff --git a/README.md b/README.md
index f8db333..51bd3b1 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,24 @@ MacPorts Ports
 A collection of ports for various projects.
 
 
+## Adding this repository source
+Clone the repository to the local filesystem:
+
+	$ cd /opt/local/var/macports/sources/
+	$ sudo mkdir -p github.com/teddywing/macports-ports/
+	$ sudo chown -R $USER:admin github.com
+	$ git clone https://github.com/teddywing/macports-ports.git github.com/teddywing/macports-ports
+
+Edit the `/opt/local/etc/macports/sources.conf` and add the following line
+_above_ the default MacPorts source:
+
+	file:///opt/local/var/macports/sources/github.com/teddywing/macports-ports
+
+Synchronize the ports tree:
+
+	sudo port -v sync
+
+
 ## License
 Licensed under the Mozilla Public License v. 2.0 (see the included LICENSE
 file).