Update README.md

Author: fragosog

README.md

@@ -1,2 +1,81 @@
 # nci-diff-CDISC
 diff specific for CDISC reports
+
+CDISC Changes Report Generator
+==============================
+
+This program will generate a changes report between two CDISC releases.
+The releases may span any amount of time.
+
+Requirements
+------------
+Git
+Apache Ant
+Java Developers Kit
+
+Building the program
+--------------------
+
+Clone the DiffCDISC repository onto your local filesystem using Git.
+
+C:\> git clone https://github.com/NCIEVS/diff-cdisc.git
+
+Open a Command Prompt and navigate to the repository directory.
+
+Run an ant build
+
+C:\DiffCDISC> ant build
+
+This will create a 'classes' and add a jar file to the 'dist' directory 
+where program dependancies are stored.  The program is now ready to run.
+
+NOTE: If the build fails, you may need to inspect your ant configurations.
+See: https://ant.apache.org/manual/
+
+Preparing data for the program
+------------------------------
+
+Users should pull two reports in .txt format from the same EVS CDISC
+Archive directory (e.g., ADaM, SDTM, SEND).
+
+Included in this repository are two example reports from the SDTM Archive
+directory.  The example below will demonstrate how to run the program
+using these two files.
+
+Running the program
+-------------------
+
+Each report is input into the program (newest followed by oldest),
+followed by a "release date" and then the filename of the output.
+
+C:\DiffCDISC\dist>RunChanges "..\docs\SDTM Terminology 2015-09-25.txt" "..\docs\SDTM Terminology 2015-06-26.txt" "9/25/2015" Changes.txt
+Initializing diff report...
+Getting changes...
+Printing changes report...
+
+About the program
+-----------------
+
+The following changes between CDISC releases are detected.  In the event 
+of an Update, original and new values are reported.
+
+- Add new CDISC Synonym
+- Add new term to existing codelist
+- Add new term to new codelist
+- Addition of new codelist
+- Remove CDISC Synonym
+- Remove term entirely from codelist
+- Remove term from retired codelist
+- Retire codelist
+- Update CDISC Codelist Name
+- Update CDISC Definition
+- Update CDISC Extensible List
+- Update CDISC Submission Value
+- Update NCI Preferred Term
+
+Known issues
+------------
+
+The 'Request Code' column will always be empty as they are stored in the
+JIRA tracking system.  This column is manually populated by EVS before
+each quarterly release.