🗒️ Add README.md

README.md

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+# cfig
+
+A configuration manager for Python 
+
+```python
+import cfig
+
+config = cfig.Configuration()
+
+@config.required()
+def SECRET_KEY(val: str) -> str:
+    """Secret string used to manage tokens."""
+    return val
+
+if __name__ == "__main__":
+    config.cli()
+```
+
+```console
+$ python -m cfig.sample
+=== Configuration ===
+
+SECRET_KEY    → Required, but not set.
+Secret string used to manage HTTP session tokens.
+```
+
+\[ [**Documentation**]() | [**PyPI**](https://pypi.org/project/cfig/) \]