Add wiki: Sync N first files, "get N movies for watching" (fixes #336)

wiki/Sync-N-first-files-get-N-movies-for-watching.md

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+User [SerVB](https://github.com/SerVB) made a script to care about moving files into the Syncthing folder until N movie episodes are present.
+
+See [syncthing#1279](https://github.com/syncthing/syncthing-android/issues/1279) for more details on the idea.
+
+Thanks for your contribution!
+
+# sequentialMover.py
+Source: [https://gist.github.com/SerVB/26fd23d9b4e0b8aa57a6169ab1508812](https://gist.github.com/SerVB/26fd23d9b4e0b8aa57a6169ab1508812)
+
+Copy of the script from the source linked above by 2019-02-24_12:48
+
+```
+# https://stackoverflow.com/a/2725908/6639500
+# https://github.com/syncthing/syncthing-android/issues/1279
+
+import json
+import os
+
+params = json.load(open("sequentialMoverParams.json", "r"))
+
+SOURCE_DIR = str(params["source"])
+DIST_DIR = str(params["dist"])
+COUNT = int(params["count"])
+EXCEPTIONS = set(map(str, params["exceptions"]))
+
+del params
+
+seriesDirs = []
+for (dirPath, dirNames, fileNames) in os.walk(SOURCE_DIR):
+    seriesDirs.extend(filter(lambda dirName: dirName not in EXCEPTIONS, map(str, dirNames)))
+    break
+
+presentedEpisodes = dict()
+
+for seriesDir in seriesDirs:
+    distSeriesDir = os.path.join(DIST_DIR, seriesDir)
+
+    if os.path.isdir(distSeriesDir):
+        for (dirPath, dirNames, fileNames) in os.walk(distSeriesDir):
+            presentedEpisodes[seriesDir] = len(fileNames)
+            break
+    else:
+        presentedEpisodes[seriesDir] = 0
+
+neededEpisodes = dict()
+
+for (seriesDir, episodes) in presentedEpisodes.iteritems():
+    if episodes < COUNT:
+        neededEpisodes[seriesDir] = COUNT - episodes
+
+for (seriesDir, episodes) in neededEpisodes.iteritems():
+    srcSeriesDir = os.path.join(SOURCE_DIR, seriesDir)
+    distSeriesDir = os.path.join(DIST_DIR, seriesDir)
+
+    if not os.path.isdir(distSeriesDir):
+        os.makedirs(distSeriesDir)
+
+    for (dirPath, dirNames, fileNames) in os.walk(srcSeriesDir):
+        for fileName in fileNames:
+            if episodes <= 0:
+                break
+
+            episodes -= 1
+
+            srcEpisodePath = os.path.join(dirPath, fileName)
+            distEpisodePath = os.path.join(distSeriesDir, fileName)
+
+            os.rename(srcEpisodePath, distEpisodePath)
+
+
+# https://gist.github.com/jacobtomlinson/9031697
+def removeEmptyFolders(path, removeRoot=True):
+    if not os.path.isdir(path) or ".stfolder" in path:
+        return
+
+    # remove empty subfolders
+    files = os.listdir(path)
+    if len(files):
+        for f in files:
+            fullpath = os.path.join(path, f)
+            if os.path.isdir(fullpath):
+                removeEmptyFolders(fullpath)
+
+    # if folder empty, delete it
+    files = os.listdir(path)
+    if len(files) == 0 and removeRoot:
+        print("Removing empty folder: %s" % path)
+        os.rmdir(path)
+
+
+removeEmptyFolders(SOURCE_DIR, False)
+removeEmptyFolders(DIST_DIR, False)
+```