simplex messaging api types and docs generation (#32)

* simplex messaging api types and docs generation

* api endpoints annotations

* endpoint titles

* refactor

simplex-messaging-api/src/Main.hs

@@ -0,0 +1,15 @@
+module Main where
+
+import Simplex.Messaging.ServerAPI
+import Servant
+import Servant.Docs
+
+apiDocs :: API
+apiDocs = docsWith
+            defaultDocOptions
+            [serverApiIntro]
+            serverApiExtra
+            (Proxy :: Proxy ServerAPI)
+
+main :: IO ()
+main = (writeFile "../simplex-messaging-api.md" . markdown) apiDocs