Update README. Root-level readme is going to go out of date

Since the root readme can't give us much information on each model,
we'll just add some ASCII art.

docs/README.md

@@ -0,0 +1,26 @@
+storyteller-ml
+==============
+The ML models that power FakeYou and other Storyteller functions.
+
+This repository is in a bit of a rough shape, but should be improving.
+
+TTS models (Tacotron, HifiGan, WaveGlow, etc.) live under [`tts/`, and you can find documentation there](tts/). 
+
+We expect to add video, posture estimation, phoneme prediction, and other models soon.
+
+FakeYou Backend Architecture
+----------------------------
+We have a Rust monolith that controls the user interface, account system, and all the database CRUD operations.
+It doesn't do any ML work itself or have any attached GPUs.
+
+There are a series of worker pods ("jobs") that pull from work queues and run inference, then upload the results.
+
+![](./diagrams/microservices.png)
+
+The jobs are written in Rust and either shell out to Python code or call an in-container Python server that attempts 
+to LRU cache models in memory.
+
+![](./diagrams/jobs1.png)
+
+![](./diagrams/jobs2.png)
+