Create codegen.md

Author: mattcuento

docs/codegen.md

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+### Code Generation Manual
+
+### Directions
+
+1. Log in to the front-end app with valid credentials
+2. Collect the JWT Auhtorization token by navigating to local storage and copying the "jwt" value
+3. Run the following command
+
+```
+AUTH_TOKEN=xxxxx npm run generate
+```
+*replace the xxxx with the token as is, no added quotations