Merge pull request #67 from lincc-frameworks/update_readme

update readme

README.md

@@ -1,5 +1,28 @@
 # nested-pandas
-WORK IN PROGRESS: Efficient Pandas representation for nested associated datasets.
+Efficient pandas representation for nested associated datasets.
+
+Nested-Pandas extends the [pandas](https://pandas.pydata.org/) package with 
+tooling and support for nested dataframes packed into values of top-level 
+dataframe columns. [Pyarrow](https://arrow.apache.org/docs/python/index.html) 
+is used intrinsically to aid in scalability and performance.
+
+![image](./nestedframe.png)
+
+Nested-Pandas is motivated by time-domain astronomy use cases, where we see
+typically two levels of information, information about astronomical objects and
+then an associated set of `N` measurements of those objects. Nested-Pandas offers
+a performant and memory-efficient package for working with these types of datasets. 
+
+Core advantages being:
+* hierarchical column access
+* efficient packing of nested information into inputs to custom user functions
+* avoiding costly groupby operations
+
+
+
+This is a LINCC Frameworks project - find more information about LINCC Frameworks [here](https://lsstdiscoveryalliance.org/programs/lincc-frameworks/).
+
+
 
 [![Template](https://img.shields.io/badge/Template-LINCC%20Frameworks%20Python%20Project%20Template-brightgreen)](https://lincc-ppt.readthedocs.io/en/latest/)