Added README.md.

README.md

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+# mtxspooler
+
+Daemon to point at directories and feed files written to them into a Matrix
+channel.
+
+I use this for feeding notifications about newly downloaded shows from
+Transmission and newly recorded shows from my HDHomeRun into a channel on my
+homeserver so I can easily see them from my phone.  It's convenient because as
+long as a program (like a shell script) can write to the directory it send
+messages without needing to know anything about the authentication.
+