Add README.md

Author: emilsvennesson

README.md

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+# script.module.inputstreamhelper #
+
+A simple Kodi module that makes life easier for add-on developers relying on InputStream based-addons and DRM playback.
+
+## Features ##
+* Displays informative dialogs if required InputStream components are unavailable
+* Checks if HLS is supported in inputstream.adaptive
+* Automatically installs Widevine DRM on supported architectures (optional)
+
+## Example ##
+
+```python
+import xbmc
+import xbmcgui
+import inputstreamhelper
+
+def play_item():
+    inputstream_helper = inputstreamhelper.Helper('mpd', drm='widevine')
+    stream_url = 'http://yt-dash-mse-test.commondatastorage.googleapis.com/media/car-20120827-manifest.mpd'
+    if inputstream_helper.check_inputstream():
+        playitem = xbmcgui.ListItem(path=stream_url)
+        playitem.setProperty('inputstreamaddon', 'inputstream.adaptive')
+        playitem.setProperty('inputstream.adaptive.manifest_type', 'mpd')
+        xbmc.Player().play(item=stream_url, listitem=playitem)
+
+play_item()
+```
+
+The Helper class takes two arguments: protocol (the media streaming protocol) and the optional argument 'drm'.
+
+## Accepted protocol arguments: ##
+ * mpd
+ * ism
+ * hls
+ * rtmp
+
+## Accepted drm arguments: ##
+ * widevine
+ * com.widevine.alpha