add link to documentaiton

Author: tboland1

README.md

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 # Hetero2d
-The Hetero2d package leverages well known computational tools: pymatgen, MPInterfaces, atomate, fireworks, and custodian to perform high-throughput *ab-initio* calculations. Hetero2d is tailored to addressing scientific questions regarding the stability of 2D-substrate hetero-structured materials using an all-in-one workflow approach to model the hetero-structures formed by arbitrary 2D materials and substrates. The workflow creates, computes, analyzes and stores all relevant simulation parameters and results in a queryable MongoDB database that can be accessed through our API.
+The Hetero2d package leverages well known computational tools: pymatgen, MPInterfaces, atomate, fireworks, and custodian to perform high-throughput *ab-initio* calculations. Hetero2d is tailored to addressing scientific questions regarding the stability of 2D-substrate hetero-structured materials using an all-in-one workflow approach to model the hetero-structures formed by arbitrary 2D materials and substrates. The workflow creates, computes, analyzes and stores all relevant simulation parameters and results in a queryable MongoDB database that can be accessed through our API. Check out our [documentation](https://cmdlab.github.io/Hetero2d/)!
 
 ## Package Description
 The 2D-substrate hetero-structure workflow takes a given 2D material, 3D phase (bulk) of the 2D material, and a substrate, relaxes the structures using vdW-corrected DFT and creates hetero-structures subject to user constraints. The workflow analyzes and stores energetic stability information of various 2D hetero-structured materials to predict the feasibility of a substrate stabilizing a meta-stable 2D material