Add module documentation

README.md

@@ -1 +1,6 @@
 ## Frontend Common
+
+### Modules
+- [api](./api/README.md)
+- [fn](./fn/README.md)
+- [logger](./fn/README.md)

api/README.md

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+## api
+
+This module helps define callable API methods.
+
+### Usage example
+
+```typescript
+import { ApiMethodFactory, HttpMethod } from 'lib/api'
+
+const { make } = new ApiMethodFactory({ apiPrefix: '/api' })
+
+interface User {
+  id: string
+  name: string
+  email: string
+}
+
+interface UserRequest {
+  id: string
+}
+
+interface UserListRequest {
+  limit: number
+  offset: number
+}
+
+type UserResponse = User
+
+type UserListResponse = User[]
+
+type _ = unknown
+
+const API = {
+  user: {
+    get: make<UserResponse, UserRequest>('/users/%(id)s', HttpMethod.GET, {
+      path: ['id'],
+    }),
+    list: make<UserListResponse, UserListRequest>('/users', HttpMethod.GET, {
+      query: ['limit', 'offset'],
+    }),
+    delete: make<_, UserRequest>('/users/%(id)s', HttpMethod.DELETE, {
+      path: ['id'],
+    }),
+  },
+}
+
+const run = async () => {
+  const users = await API.user.list({ limit: 10, offset: 0 })
+
+  users.forEach(async (user) => {
+    await API.user.delete({
+      id: user.id,
+    })
+  })
+}
+```

fn/README.md

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+## fn
+
+This module contains various ramda combinations/extensions.
+
+### Available functions:
+
+- `thread` - sequentially applies transforms from the array to the first argument.
+  
+    **Example usage**:
+    ```typescript
+    import * as R from 'ramda'
+    import * as F from 'lib/fn'
+
+    const a = F.thread(5, [
+      R.add(3),
+      R.multiply(2),
+      R.dec,
+    ])
+
+    a === 15 // true
+
+    // equivalent to:
+    const transform = R.pipe(
+      R.add(3),
+      R.multiply(2),
+      R.dec,
+    )
+
+    const b = transform(5)
+
+    // or
+    const c = R.pipe(
+      R.add(3),
+      R.multiply(2),
+      R.dec,
+    )(5)
+    ```

logger/README.md

@@ -0,0 +1,3 @@
+## logger
+
+This module provides logging functionality.