Add site maxstream.tv.

Signed-off-by: Toha <tohenk@yahoo.com>

sites/maxstream.tv/readme.md

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+# maxstream.tv
+
+https://maxstream.tv/home
+
+### Download the guide
+
+```sh
+npm run grab --- --channels=sites/maxstream.tv/maxstream.tv.channels.xml
+```
+
+### Update channel list
+
+```sh
+npm run channels:parse --- --config=./sites/maxstream.tv/maxstream.tv.config.js --output=./sites/maxstream.tv/maxstream.tv.channels.xml
+```
+
+### Test
+
+```sh
+npm test --- maxstream.tv
+```