licenses: add MBROLA-VOICES license

Signed-off-by: William Hubbs <[email protected]>

licenses/MBROLA-VOICES

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+# Terms and conditions on the use of the database
+
+By obtaining, using and/or copying this database, you agree that
+you have read, understood, and will comply with these terms and conditions:
+
+Permission is granted to use this database for synthesizing speech with and only with MBROLA
+program made available from the MBROLA project web page:
+
+https://github.com/numediart/MBROLA/
+
+The distribution of this database is submitted to the same terms and conditions as the distribution of the Mbrola program.
+In addition, this database may not be sold or incorporated into any product which is sold without prior permission from the
+particular author of the voice database file (look for `license.txt` file for particular voice folder).
+
+When no charge is made, this database may be copied and distributed freely, provided that
+this notice is copied and distributed with it.
+
+# Disclaimer
+
+This database carries no warranty, expressed or implied. The user assumes all risks, known or unknown, direct or indirect,
+which involve this database in any way. In particular, the author of the database does not take any commitment
+in view of any possible third party rights.