add DOI badge

jbrown725 · web-flow · commit 22620e68ddb1 · 2021-06-28T22:50:14.000-07:00
diff --git a/docs/index.md b/docs/index.md
@@ -1,5 +1,7 @@
 # BrainGrid
 
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.3354490.svg)](https://doi.org/10.5281/zenodo.3354490)
+
 ## Table of Contents
 
 1. [Introduction](braingrid_introduction)
@@ -34,4 +36,4 @@
 
    4.1 the Growth Model
    
-   4.2 Serialization and Deserialization
+   4.2 Serialization and Deserialization
