update readme with notes on asp tests

README.md

@@ -7,3 +7,33 @@ Our objective is to release a set of standalone Python scripts that can be run a
 ## Status
 This is a work in progress, with initial notebooks compiled from recent projects using sample stereo images from the Maxar WorldView, Planet SkySat-C and BlackSky Global constellations. We plan to refine these tools in the coming year, and we welcome community contributions and input. 
 
+## Notes on tests
+
+The ASP uses this tarball for running tests (568 MB size):
+
+```
+wget https://github.com/NeoGeographyToolkit/StereoPipelineTest/releases/download/0.0.1/StereoPipelineTest.tar
+```
+
+[As specified here, it contains all tests scripts, **data**, and expected results.](https://github.com/NeoGeographyToolkit/StereoPipeline/blob/df18be8d32435f7f9db829b9fc951f59bda86e55/.github/workflows/build_test.sh#L200-L206)
+
+The `data/` directory in that tarball looks like:
+
+```
+8.9M - 13APR25_WV02_SEVZ_1030010021A8A100_10030010021A64500_DEM3-3m_10pct.tif
+ 55M - B17_016219_1978_XN_17N282W.8bit.cub
+ 37K - B17_016219_1978_XN_17N282W.8bit.json
+ 55M - B18_016575_1978_XN_17N282W.8bit.cub
+ 41K - B18_016575_1978_XN_17N282W.8bit.json
+3.1M - Copernicus_DSM.tif
+120M - M181058717LE.ce.cub
+171K - M181058717LE.ce.json
+120M - M181073012LE.ce.cub
+176K - M181073012LE.ce.json
+6.3M - Severnaya-Bedrock-UTM47-Ellipsoidal-Height.txt
+5.5M - basic_panchromatic.tif
+ 20M - ref-mars-PC.tif
+147K - ref-mars_yxz.csv
+```
+
+Can we use that data in the tests here as well? Or perhaps better to keep separate, some useful files maybe? (But probably not the `.cub` or `.json` files).