Create README.md

Author: dkatzel-ncats

README.md

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+# gsrs-spring-module-substances
+GSRS Spring Boot Module for Substances
+
+This is the GSRS 3 module for working with IDMP Substances as specified by the ISO 11238 Substance Model.
+
+## To install With FDA Extension modules
+The FDA extension and example modules in this Repository are not yet in Maven Central and so rather than
+having to make people track down those repositories, we provide sample jars that can be installed into your local maven repository.
+
+###To install the extra jars in Unix
+```
+./installExtraJars.sh 
+```
+
+###To install the extra jars in Windows
+
+```
+./installExtraJars.cmd 
+```