README added

README.md

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+# YouTube Transcript/Subtitle API (including automatically generated subtitles)
+
+This is an python API which allows you to get the transcripts/subtitles for a given YouTube video. It also works for automatically generated subtitles and it does not require a headless browser, like other selenium based solutions do!
+
+## Requirements
+
+It runs using python 2 and 3, with the only requirement being the [requests](http://docs.python-requests.org/en/master/) module. It is recommended installing it using pip:
+
+```
+pip install -r requirements.txt
+```
+
+## How to use it
+
+You could either integrate this module into an existing application, or just use it via an CLI
+
+### In code
+
+To get a transcript for a given video you can do:
+
+```python
+YouTubeTranscriptApi.get_transcript(video_id)
+```
+
+This will return a list of dictionaries looking somewhat like this:
+
+```python
+[
+    {
+        'text': 'Hey there',
+        'start': 7.58,
+        'duration': 6.13
+    },
+    {
+        'text': 'how are you',
+        'start': 14.08,
+        'duration': 7.58
+    },
+    # ...
+]
+```
+
+To get transcripts for a list fo video ids you can call:
+
+```python
+YouTubeTranscriptApi.get_transcripts(video_ids)
+```
+
+### CLI
+
+Execute the CLI script using the video ids as parameters and the results will be printed out to the command line:
+
+```
+./youtube_transcript_api.py <first_video_id> <second_video_id> ...
+```
+
+If you would prefer to write it into a file or pipe it into another application, you can also output the results as json using the following line:
+
+```
+./youtube_transcript_api.py --json <first_video_id> <second_video_id> ... > transcripts.json
+```
+
+## Warning
+
+This code uses an undocumented part of the YouTube API, which is called by the YouTube web-client. So there is no guarantee that it won't stop working tomorrow, if they change how things work. I will however do my best to make things working again as soon as possible if that happens. So if it stops working, let me know!