Add sponsorship acknowledgement section to README

Added sponsorship acknowledgement for AWS Open Data Program.

Author: nicoalee

README.md

@@ -23,6 +23,12 @@ brainlife.io is publicly funded and for the sustainability of the project it is
 [![NSF-IIS-1912270](https://img.shields.io/badge/NSF_IIS-1912270-blue.svg)](https://nsf.gov/awardsearch/showAward?AWD_ID=1912270)
 [![NIH-NIBIB-R01EB029272](https://img.shields.io/badge/NIH_NIBIB-R01EB029272-green.svg)](https://grantome.com/grant/NIH/R01-EB029272-01)
 
+### Sponsorship Acknowledgement
+
+We gratefully acknowledge the support of the AWS Open Data Program for providing S3 storage resources to brainlife.io.
+
+<img src="https://upload.wikimedia.org/wikipedia/commons/thumb/9/93/Amazon_Web_Services_Logo.svg/1280px-Amazon_Web_Services_Logo.svg.png" width="200" >
+
 ### Citations
 We kindly ask that you cite the following articles when publishing papers and code using this code.