[flow] report doc count when uploading file

This fixes
#478
There was no `markStarted` and so 'remaining' was always at 0, so the
frontend thought the job was done, even though it was getting
notification about 'succeeded' in that job increasing

src/Gargantext/API/Node/Corpus/New.hs

@@ -257,6 +257,8 @@ addToCorpusWithTempFile user cid nwtf jobHandle = do
       -- TODO Add progress (jobStatus) update for docs - this is a
       -- long action
 
+      markStarted (fromIntegral count) jobHandle
+      
       let docsC' = zipSources (yieldMany [1..]) (transPipe liftBase docsC)
                   .| mapMC (\(idx, doc) ->
                         if idx > limit then do