move into website/

website/docs/usage.md

@@ -0,0 +1,31 @@
+---
+nav_order: 30
+---
+
+## Usage
+
+Run `aider` with the source code files you want to edit.
+These files will be "added to the chat session", so that the LLM can see their
+contents and edit them according to your instructions.
+
+```
+aider <file1> <file2> ...
+```
+
+Be selective, and just add the files that the LLM will need to edit.
+If you add a bunch of unrelated files, the LLM can get overwhelmed
+and confused (and it costs more tokens).
+Aider will automatically
+share snippets from other, related files with the LLM so it can
+[understand the rest of your code base](https://aider.chat/docs/repomap.html).
+
+You can also just launch aider anywhere in a git repo without naming
+files on the command line.  It will discover all the files in the
+repo.  You can then add and remove individual files in the chat
+session with the `/add` and `/drop` chat commands described below.
+If you or the LLM mention any of the repo's filenames in the conversation,
+aider will ask if you'd like to add them to the chat.
+
+Aider also has many other options which can be set with
+command line switches, environment variables or via a configuration file.
+See `aider --help` for details.