add pear worker (#113)

* add pear worker

* fixes

reference/pear/api.md

@@ -261,6 +261,24 @@ async function logPrefUpdates () {
 logPrefUpdates().catch(console.error)
 ```
 
+## `Pear.worker <Object>`
+
+Pear Worker is used to spawn processes and facilitate communication between the parent and child processes in the Pear Runtime.
+
+The spawned worker process inherits standard input, output, and error from the parent process.
+
+A bidirectional pipe is also created which enables communication between the parent and worker process.
+
+Reference counting is handled automatically to manage the sidecar lifecycle.
+
+### `const pipe = Pear.worker.run(key <String>)`
+
+Spawns a new process with the specified key as the entry point. Resolves to a `Duplex` stream object representing a pipe.
+
+### `const pipe = Pear.worker.pipe()`
+
+Returns the communication pipe created to the worker process. Resolves to a `Duplex` stream object representing a pipe.
+
 ## `Pear.media <Object>`
 
 Media interface