Add missing type annotations to api methods

Add "__*" to .gitignore, to ignore temporary files

.gitignore

@@ -1,3 +1,4 @@
 /config.py
 __pycache__/
 *.pyc
+__*

grzegorz_clients/api.py

@@ -78,11 +78,11 @@ def get_playback_pos():
     return f"time"
 
 @request_post
-def seek_absolute(pos):
+def seek_absolute(pos:float):
     args = urlencode(locals())
     return f"time?{args}", None
 
 @request_post
-def seek_percent(percent):
+def seek_percent(percent:int):
     args = urlencode(locals())
     return f"time?{args}", None