Addding README for the master branch.

README.md

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+# OSIRIS Data Reduction Pipeline
+
+To install and run the OSIRIS DRP, you will need the following:
+
+- A working C compiler (e.g. ``gcc``)
+- A copy of the compiled library cfitsio
+- A working installation of IDL
+
+## Pipeline Version
+
+The current pipeline version is v3.2 and is released in the master branch of this repository. Clone the repository, compile, and run. 
+
+If you would like to try out the development version for reducing data, you can switch to the the develop branch.
+
+If you would like to work on OSIRIS pipeline code, please fork the develop branch into your own git account. Once your modifications are complete, submit a pull request. 
+
+## Running the Pipeline
+
+Please check out the OSIRIS pipeline manual: <http://www2.keck.hawaii.edu/inst/osiris/OSIRIS_Manual_v2.3.pdf>
+
+## Troubleshooting
+
+If you run into problems, please re-read this README.md.