Update license info in README.

README.md

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 # File Manager
+
 NASA core Flight System File Manager Application
 
 ## Description
@@ -10,3 +11,7 @@ The cFS is a platform and project independent reusable software framework and se
 The FM application provides onboard file system management services by processing ground commands for copying, moving, and renaming files, decompressing files, creating directories, deleting files and directories, providing file and directory informational telemetry messages, and providing open file and directory listings.
 
 FM requires use of the [cFS application library](https://github.com/nasa/cfs_lib).
+
+## License
+
+This software is licensed under the NASA Open Source Agreement. http://ti.arc.nasa.gov/opensource/nosa