Revert "Update README.md"

This reverts commit ffd3aca4ce.

README.md

@@ -19,12 +19,22 @@ GPT Engineer is made to be easy to adapt, extend, and make your agent learn how
 - Fast handovers back and forth between AI and human
 - Simplicity, all computation is "resumable" and persisted to the filesystem
 
-## Setup
+## Usage
+
+Choose either **stable** or **development**.
+
+For **stable** release:
+
+- `pip install gpt-engineer`
+
+For **development**:
 - `git clone git@github.com:AntonOsika/gpt-engineer.git`
 - `cd gpt-engineer`
 - `pip install -e .`
   - (or: `make install && source venv/bin/activate` for a venv)
 
+**Setup**
+
 With an api key that has GPT4 access run:
 
 - `export OPENAI_API_KEY=[your api key]`