docs: add readme

ai-conversation/README.md

@@ -1,5 +1,28 @@
 # Conversation
 This proof of concept is for implementing conversational loop with AI at a low level with raw C.
 
+## How it works
+This simple program:
+1. Captures audio samples for x seconds into a local file using alsa
+2. Sends the raw pcm data to Deepgram STT API for transcription
+3. Uses the transcript to call Anthropic to get an assistant's response
+4. Converts Anthropic's response to audio using Deepgram's TTS
+5. Plays back the generated audio from Deepgram using alsa
+6. Quits. _There is no conversational loop at the time of this writing._
+
 ## Requirements
 Platform: the project is meant for Linux, specifically Ubuntu desktop.
+
+* libcurl
+* build-essential
+* libasound2-dev
+
+_See more deps in Makefile `install-deps` command._
+
+## Getting started
+1. Add `DEEPGRAM_API_KEY` and `ANTHROPIC_API_KEY` to `.bashrc` as environment variables.
+2. Build & run
+```sh
+make
+./main
+```