update readme.

README.md

@@ -1,16 +1,26 @@
 # archimedes_test
 
-A new Flutter project.
+This may evolve into a full-fledged library.
+
+It's purpose is to provide an open source
+[Structure from Motion](https://en.wikipedia.org/wiki/Structure_from_motion)
+(SFM) library for Android.
+
+Currently one doesn't exist. The _technology_ exists (i.e. [Polycam](https://poly.cam/)),
+but no open source library for SFM exists.
+
+The problem here is that most open source SFM librarires rely on pytorch.
+
+So this project essentially has to create all SFM features from scratch. In fact, I'm
+copying the algorithm direcly from the [OpenSFM project](https://github.com/mapillary/OpenSfM).
 
 ## Getting Started
 
-This project is a starting point for a Flutter application that follows the
+I'm starting small. Focusing on testors. Yes, unit tests are included.
-[simple app state management
-tutorial](https://flutter.dev/docs/development/data-and-backend/state-mgmt/simple).
 
-For help getting started with Flutter development, view the
+Run `flutter test` to run tests. Then you know it's working.
-[online documentation](https://flutter.dev/docs), which offers tutorials,
+
-samples, guidance on mobile development, and a full API reference.
+But currently tensors aren't fully implemented.
 
 ## Assets