SDL_mixer: really added LICENSE.txt file..

From 371bf1575913828c46212e9220d4a4685ed66bb5 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Mon, 29 Mar 2021 00:32:53 +0300
Subject: [PATCH] really added LICENSE.txt file..

---
 LICENSE.txt | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 LICENSE.txt

diff --git a/LICENSE.txt b/LICENSE.txt
new file mode 100644
index 0000000..3c82ac8
--- /dev/null
+++ b/LICENSE.txt
@@ -0,0 +1,17 @@
+Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>
+
+This software is provided 'as-is', without any express or implied
+warranty.  In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
+   appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.