docs: update README.md to enhance environment loader description and use cases

README.md

@@ -1,3 +1,24 @@
 # multinut
 
-The multitool nobody asked for. Includes stuff like `greet()`, `add()`, and other functions you'll forget are here.
+The multitool nobody asked for. Includes stuff and so
+
+---
+
+## `multinut.env`
+
+A simple but flexible environment loader.
+Supports `.env` file parsing with optional mode suffixes (e.g. `.env.production`, `.env.testing`, etc.), lazy loading, and dynamic access.
+
+Useful when:
+
+* You want a single class that can load environment configs based on mode (`development`, `production`, etc.)
+* You need access via `env["KEY"]`, `env.get("KEY")`, or even `env.KEY`
+* You want optional type casting and sane default handling
+* You *don’t* want `os.environ` to be touched
+
+### Use cases
+
+* Loading `.env` files in mode-aware Python projects
+* Separating secrets and configs by deployment context
+* Dynamically reading values like `env.DB_URL`, `env.get("DEBUG", default=False, cast=bool)`
+* Avoiding external dependencies beyond `python-dotenv`