Update README.md

README.md

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 This repository is used to work toward the development of an official OGC web ontology for coordinate reference systems (CRS). 
 At present, we're simply working on documenting the benefits of a CRS ontology, but we're hoping that more will come as people determine value in the work.
 
-## Definitions
+## Definitions 
 **spatial reference system:** A spatial reference system (SRS) is a system for establishing spatial position. A spatial reference system can use geographic identifiers (place names, for example), coordinates (in which case it is a coordinate reference system), or identifiers with structured geometry (in which case it is a discrete global grid system).
 
 **coordinate system:** A coordinate system is a set of mathematical rules for specifying how coordinates are to be assigned to points.