add readme

Author: cleclefibanity

README.md

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+# Postman collections for Ponto API
+
+## Setup
+
+1) import the collection(s) into Postman
+2) Create Postman env
+
+### Postman env
+
+#### Global variables
+
+* `ponto-hostname`: the Ponto API hostname (eg: api.myponto.com)
+* `ponto-client-id`: the client-id from your Ponto integration that you can find in your Ponto Dashboard
+* `ponto-client-secret`: related secret