Decompose monolithic readme into docs/ directory structure

docs/usage.md

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+# Usage
+
+The following shows general usage.
+
+```typescript
+import { Type, type Static } from "@alkdev/typebox";
+
+//--------------------------------------------------------------------------------------------
+//
+// Let's say you have the following type ...
+//
+//--------------------------------------------------------------------------------------------
+
+type T = {
+  id: string;
+  name: string;
+  timestamp: number;
+};
+
+//--------------------------------------------------------------------------------------------
+//
+// ... you can express this type in the following way.
+//
+//--------------------------------------------------------------------------------------------
+
+const T = Type.Object({
+  // const T = {
+  id: Type.String(), //   type: 'object',
+  name: Type.String(), //   properties: {
+  timestamp: Type.Integer(), //     id: {
+}); //       type: 'string'
+//     },
+//     name: {
+//       type: 'string'
+//     },
+//     timestamp: {
+//       type: 'integer'
+//     }
+//   },
+//   required: [
+//     'id',
+//     'name',
+//     'timestamp'
+//   ]
+// }
+
+//--------------------------------------------------------------------------------------------
+//
+// ... then infer back to the original static type this way.
+//
+//--------------------------------------------------------------------------------------------
+
+type T = Static<typeof T>; // type T = {
+//   id: string,
+//   name: string,
+//   timestamp: number
+// }
+
+//--------------------------------------------------------------------------------------------
+//
+// ... or use the type to parse JavaScript values.
+//
+//--------------------------------------------------------------------------------------------
+
+import { Value } from "@alkdev/typebox/value";
+
+const R = Value.Parse(T, value); // const R: {
+//   id: string,
+//   name: string,
+//   timestamp: number
+// }
+```
+
+---
+
+[Back to Home](../readme.md)