Update README.md

README.md

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 # rest_api
 a sample REST API in Django and Python for employees. Supports GET, POST, PUT, DEL
+Some notes on usage:
+- GET /employees/
+- GET /employees/3/
+- PUT /employees/3/ and must include all 3 key/value parameters (name, position, department)
+- POST /employees/ and must include all 3 key/value parameters (name, position, department)
+- DEL /employees/3/