Added initial documentation for installation

INSTALL

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+#PyBitmessage Installation Instructions 
+
+For an up-to-date version of these instructions, please visit the
+[Bitmessage Wiki](https://bitmessage.org/wiki/Compiling_instructions).
+
+PyBitmessage can be run either straight from source or from an installed
+packaged.
+
+##Dependencies
+Before running PyBitmessage, make sure you have all the needed dependencies
+installed on your system.
+
+Here's a list of dependencies needed for PyBitmessage
+- python2.7
+- python2-qt4 (python-qt4 on Debian/Ubuntu)
+- openssl
+- (Fedora & Redhat only) openssl-compat-bitcoin-libs 
+
+##Running PyBitmessage
+PyBitmessage can be run two ways: straight from source or via a package which
+is installed on your system. Since PyBitmessage is Beta, it is best to run
+PyBitmessage from source, so that you may update as needed.
+
+####Updating
+To update PyBitmessage from source (Linux/OS X), you can do these easy steps:
+```
+cd PyBitmessage/src/
+git fetch --all
+git reset --hard origin/master
+python bitmessagemain.py
+```
+Viola! Bitmessage is updated!
+
+####Linux
+To run PyBitmessage from the command-line, you must download the source, then
+run `src/bitmessagemain.py`.
+```
+git clone git://github.com/Bitmessage/PyBitmessage.git
+cd PyBitmessage/ && python src/bitmessagemain.py
+```
+
+That's it! *Honestly*!
+
+####Windows
+In Windows you can download an executable for Bitmessage
+[here](https://bitmessage.org/download/windows/Bitmessage.exe).
+
+However, if you would like to run PyBitmessage via Python in Windows, you can
+go [here](https://bitmessage.org/wiki/Compiling_instructions#Windows) for
+information on how to do so.
+
+####OS X
+First off, install Homebrew.
+```
+ruby -e "$(curl -fsSL https://raw.github.com/mxcl/homebrew/go)"
+```
+
+Now, install the required dependencies
+```
+sudo port install python27 py27-pyqt4 openssl
+sudo port install git-core +svn +doc +bash_completion +gitweb
+```
+
+Download and run PyBitmessage:
+```
+git clone git://github.com/Bitmessage/PyBitmessage.git
+cd PyBitmessage && python src/bitmessagemain.py
+```
+
+##Creating a package for installation
+If you really want, you can make a package for PyBitmessage which you may
+install yourself or distribute to friends. This isn't reccomended, since
+PyBitmessage is in Beta, and subject to frequent change.
+
+####Linux
+
+First off, since PyBitmessage uses something nifty called
+[packagemonkey](https://github.com/fuzzgun/packagemonkey), go ahead and get
+that installed. You may have to build it from source.
+
+Next, edit the generate.sh script. To your liking.
+
+Now, run the appropriate script for the type of package you'd like to make
+```
+arch.sh - create a package for Arch Linux
+debian.sh - create a package for Debian/Ubuntu
+ebuild.sh - create a package for Gentoo
+osx.sh - create a package for OS X
+puppy.sh - create a package for Puppy Linux
+rpm.sh - create a RPM package
+slack.sh - create a package for Slackware
+```
+
+####OS X
+Please refer to
+[this page](https://bitmessage.org/forum/index.php/topic,2761.0.html) on the
+forums for instructions on how to create a package on OS X.
+
+Please note that some versions of OS X don't work.
+###Windows
+#TODO: Create Windows package creation instructions