Add speech dispatcher example

examples/speech-dispatcher/mimic3-generic.conf

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+GenericExecuteSynth "printf %s \'$DATA\' | /path/to/mimic3-client --voice \'$VOICE\'  --stdout | $PLAY_COMMAND"
+AddVoice "en-us" "MALE1" "en_UK/apope_low"

examples/speech-dispatcher/speechd.conf

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+DefaultVoiceType  "MALE1"
+DefaultModule mimic3-generic

examples/systemd/mimic3.service

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+[Unit]
+Description=Run Mimic 3 web server
+Documentation=https://github.com/MycroftAI/mimic3
+
+[Service]
+ExecStart=/path/to/mimic3-server
+
+[Install]
+WantedBy=default.target