Add acknowledgments to README.md

Author: Damian Rouson

README.md

@@ -95,16 +95,27 @@ fpm run --example read-from-json > dag.json
 fpm run --example dag-to-dot > feats-dag.dot
 dot -Tpdf -o feats.pdf feats.dot
 ```
-which should produce the graph below.
+which should produce the following graph below:
 
 ![feats-dependencies](https://user-images.githubusercontent.com/13108868/133311851-721b7cda-1d10-4ee1-a51d-6169ca624839.png)
 
-
 License
 -------
 
 This library is released under a [BSD-3 license].
 
+Acknowledgments
+----------------
+
+| | |
+|-|-|
+| We gratefully acknowledge support from [NASA Langley Research Center] under contract number 80NSSC20P2246.  | <img src="https://user-images.githubusercontent.com/13108868/112893191-304ce180-908f-11eb-8bea-e0cab5322aa8.png" alt="NASA logo" width="100">|
+
+Donate
+------
+If you find this software useful, please consider donating code or
+[currency](http://bit.ly/donate-to-sourcery-institute) to aid in development efforts.
+
 [daglib by Jacob Williams]: https://github.com/jacobwilliams/daglib
 [GraphViz]: https://www.graphviz.org
 [OpenCoarrays]: https://github.com/sourceryinstitute/opencoarrays