Decompose monolithic readme into docs/ directory structure

docs/values/clean.md

@@ -0,0 +1,20 @@
+[Overview](../overview.md) | [Installation](../installation.md) | [Usage](../usage.md) | [Types](../types/) | **Values** | [Syntax](../syntax/) | [TypeRegistry](../type-registry.md) | [TypeCheck](../type-check.md)
+
+# Clean
+
+Use Clean to remove excess properties from a value. This function does not check the value and returns an unknown type. You should Check the result before use. Clean is a mutable operation. To avoid mutation, Clone the value first.
+
+```typescript
+const T = Type.Object({
+  x: Type.Number(),
+  y: Type.Number(),
+});
+
+const X = Value.Clean(T, null); // const 'X = null
+
+const Y = Value.Clean(T, { x: 1 }); // const 'Y = { x: 1 }
+
+const Z = Value.Clean(T, { x: 1, y: 2, z: 3 }); // const 'Z = { x: 1, y: 2 }
+```
+
+Back to [Home](../../readme.md)