fix #27306: provide licence for Fluid sf3 file

share/sound/LICENSE.txt

@@ -0,0 +1,66 @@
+FluidR3 SF3 Licence
+
+The FluidR3 SF3 soundfont was compressed from the Fluid R3 SF2 soundfont and retains the copyright and licencing of the original and uncompressed sound font as follows:
+More info about the SF3 format and compression algorithm: https://github.com/wschweer/sftools
+
+----
+
+Fluid (R3) SoundFont 
+
+Copyright � 2000-2002, 2008 Frank Wen <getfrank@gmail.com>
+
+I hereby release Fluid under the MIT license, as described in below. 
+
+Thanks to Toby Smithe for helping to get Fluid included in Ubuntu.
+
+This package, of course, is the original Release 3 of Fluid.  
+
+
+Fluid was constructed in part from samples found in the public domain that I
+ edited/cleaned/remixed/programmed and largely from recordings of my own and
+ in conjunction with the people below who helped along the way: 
+
+Suren M. Seron
+ Scott Hanan 
+Steve Aupperle 
+Chris Gillman 
+Alex Taubr
+ Chris Prola 
+Andrew Klenk
+ Winfried Hubbe 
+Dylan
+ Tim
+ Gort 
+Uros Katic 
+Ethan Winer (http://www.ethanwiner.com) 
+
+
+It's obviously been a few years since the project, but its nice to see that 
+people are still enjoying my work and getting good use out of it.  As always,
+I'd like to hear some work done with Fluid so email me, or just email me to
+say hello and tell me what is going on in the computer musician world.
+Who knows, maybe I'll kick start this project again? ;)
+
+
+
+
+Permission is hereby granted, free of charge, to any person 
+obtaining a copy of this software and associated documentation 
+files (the "Software"), to deal in the Software without
+ restriction, including without limitation the rights to use, 
+copy, modify, merge, publish, distribute, sublicense, and/or sell 
+copies of the Software, and to permit persons to whom the
+ Software is furnished to do so, subject to the following 
+conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software. 
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 
+OTHER DEALINGS IN THE SOFTWARE.