chore: add map_std package readme

packages/map_std/README.md

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+[Website](https://superface.ai) | [Get Started](https://superface.ai/docs/getting-started) | [Documentation](https://superface.ai/docs) | [GitHub Discussions](https://sfc.is/discussions) | [Twitter](https://twitter.com/superfaceai) | [Support](https://superface.ai/support)
+<br />
+<br />
+<img src="https://github.com/superfaceai/one-sdk/raw/main/docs/LogoGreen.png" alt="Superface" width="100" height="100">
+
+# Superface OneSDK Map standard library
+
+Types for development against the OneSDK map standard library.
+
+## Setup
+
+To setup an environment for language support when developing tools:
+
+```shell
+npm install @superfaceai/map-std
+```
+
+To define a usecase define a new type in a TypeScript `example.profile.ts` file:
+
+```typescript
+/// <reference types="@superface/map-std" />
+
+type Example = Usecase<{
+  safety: 'safe'
+  input: {
+	/** Id of the thing to fetch. */
+	id: AnyValue
+  }
+  result: { name: string }
+  error: { title: AnyValue, detail?: AnyValue }
+}>;
+```
+
+Then develop a map with type support:
+
+```javascript
+/// <reference types="@superface/map-std" />
+/// <reference path="./example.profile.ts" />
+// @ts-check
+
+/** @type {Example} */
+var Example = ({ input, parameters, services }) => {
+	return { name: "hardcoded example" }
+}
+```
+
+For more examples see [examples in OneSDK repository](https://github.com/superfaceai/one-sdk/tree/main/examples/comlinks).
+
+## License
+
+OneSDK is licensed under the [MIT License](LICENSE).
+
+© 2023 Superface s.r.o.