add releaseit and docgen

Author: Jack Tang

.release-it.json

@@ -0,0 +1,17 @@
+{
+  "github": {
+    "release": true,
+    "releaseName": "Release ${version}",
+    "preRelease": false,
+    "draft": false,
+    "tokenRef": "GITHUB_TOKEN",
+    "assets": "",
+    "timeout": 0
+  },
+  "hooks": {
+    "after:bump": [
+      "nimble version ${version}",
+      "nimble docgen"
+    ]
+  }
+}

README.md

@@ -9,7 +9,7 @@ Each thread is associated with one channel. Threads process its channel with asy
 
 Two communication patterns are provided:
 - `send` is uni-directional, sending data to channel of target thread.
-- `ask` is bi-directional, request-and-reply style with returning type `Future[JsoNode]`, use like remote procedure call. 
+- `ask` is bi-directional, request-and-reply style with returning type `Future[JsonNode]`, use like remote procedure call. 
 
 Each thread has a fixed unique `name`. All threads can talk with each other by name. The order of creation of threads does not matter, as long as the target thread is created before calling `send` or `ask`.
 
@@ -60,5 +60,8 @@ when isMainModule:
   main()
 ```
 
+## Manually Create Thread
+
+