filled out (#6)

Reviewed-on: #6
Co-authored-by: kdeng00 <kundeng00@pm.me>
Co-committed-by: kdeng00 <kundeng00@pm.me>

README.md

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+This is a library used to retrieve environment variables associated with various
+icarus projects. Rather than having the various icarus projects such as icarus,
+icarus_auth, songparser, and others, have environment code, it would be more
+efficient to consolidate it. Especially, if there are commonly used environment
+variables used throughout the apps.