add option to enable logging (#216)

Co-authored-by: Evgeny Poberezkin <2769109+epoberezkin@users.noreply.github.com>

src/Simplex/Chat/Options.hs

@@ -15,7 +15,8 @@ import System.FilePath (combine)
 
 data ChatOpts = ChatOpts
   { dbFile :: String,
-    smpServers :: NonEmpty SMPServer
+    smpServers :: NonEmpty SMPServer,
+    logging :: Bool
   }
 
 chatOpts :: FilePath -> Parser ChatOpts
@@ -45,6 +46,11 @@ chatOpts appDir =
                 ]
             )
       )
+    <*> switch
+      ( long "log"
+          <> short 'l'
+          <> help "Enable logging"
+      )
   where
     defaultDbFilePath = combine appDir "simplex_v1"