Update README with supported datasets and requirements

Author: trey-stafford

README.md

@@ -11,10 +11,18 @@
 > that is well-tested and peer-reviewed, but nothing contained here should be
 > expected to work correctly (or at all!) in this early phase.
 
-Spike repo to explore replicating the functionality of
-[valkyrie](https://bitbucket.org/nsidc/valkyrie) as a Python library for use in
-[iceflow](https://github.com/nsidc/NSIDC-Data-Tutorials/tree/main/notebooks/iceflow)
-as part of work for <https://github.com/nsidc/tps-ecs-decom-notes/issues/8>
+`iceflow` is a Python library that provides the ability to search, download, and
+access laser altimetry data from (pre-)Operation Icebridge and ICESat datasets.
+`iceflow` supports the following datasets:
+
+| Dataset                                                  | Temporal Coverage             |
+| -------------------------------------------------------- | ----------------------------- |
+| [ILATM1B v1](https://nsidc.org/data/ilatm1b/versions/1)  | 2009-03-31 through 2012-11-08 |
+| [ILATM1B v2](https://nsidc.org/data/ilatm1b/versions/2)  | 2013-03-20 through 2019-11-20 |
+| [BLATM1B v1](https://nsidc.org/data/blatm1b/versions/1)  | 1993-06-23 through 2008-10-30 |
+| [ILVIS2 v1](https://nsidc.org/data/ilvis2/versions/1)    | 2009-04-14 through 2015-10-31 |
+| [ILVIS2 v2](https://nsidc.org/data/ilvis2/versions/2)    | 2017-08-25 through 2017-09-20 |
+| [GLAH06 v034](https://nsidc.org/data/glah06/versions/34) | 2003-02-20 through 2009-10-11 |
 
 ## Level of Support
 
@@ -26,7 +34,8 @@ contact [email protected] for more information.
 
 ## Requirements
 
-TODO
+- [python](https://www.python.org/) >=3.10
+- [Earthdata Login account](https://urs.earthdata.nasa.gov/)
 
 ## Usage