Add MATLAB syntax test file

tests/syntax-tests/highlighted/MATLAB/test.matlab

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+function zz=sample(aa)
+%%%%%%%%%%%%%%%%%%
+% some comments
+%%%%%%%%%%%%%%%%%%
+
+x = 'a string';    % some 'ticks' in a comment
+y = 'a string with ''interal'' quotes';
+
+for i=1:20
+  disp(i);
+end
+
+a = rand(30);
+b = rand(30);
+
+c = a .* b ./ a \ ... comment at end of line and continuation
+    (b .* a + b - a);
+
+c = a' * b';  % note: these ticks are for transpose, not quotes.
+
+disp('a comment symbol, %, in a string');
+
+!echo abc % this isn't a comment - it's passed to system command
+
+function y=myfunc(x)
+y = exp(x);
+
+%{
+  a block comment
+%}
+
+function no_arg_func
+fprintf('%s\n', 'function with no args')
+end

tests/syntax-tests/source/MATLAB/LICENSE.md

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+The `test.matlab` file is a modified version of https://github.com/pygments/pygments/blob/3e1b79c82d2df318f63f24984d875fd2a3400808/tests/test_matlab.py under the following license: 
+
+Copyright (c) 2006-2020 by the respective authors (see AUTHORS file).
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+* Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimer in the
+  documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

tests/syntax-tests/source/MATLAB/test.matlab

@@ -0,0 +1,34 @@
+function zz=sample(aa)
+%%%%%%%%%%%%%%%%%%
+% some comments
+%%%%%%%%%%%%%%%%%%
+
+x = 'a string';    % some 'ticks' in a comment
+y = 'a string with ''interal'' quotes';
+
+for i=1:20
+  disp(i);
+end
+
+a = rand(30);
+b = rand(30);
+
+c = a .* b ./ a \ ... comment at end of line and continuation
+    (b .* a + b - a);
+
+c = a' * b';  % note: these ticks are for transpose, not quotes.
+
+disp('a comment symbol, %, in a string');
+
+!echo abc % this isn't a comment - it's passed to system command
+
+function y=myfunc(x)
+y = exp(x);
+
+%{
+  a block comment
+%}
+
+function no_arg_func
+fprintf('%s\n', 'function with no args')
+end