docs: update README and add LICENSE from PinMAME

LICENSE

@@ -0,0 +1,29 @@
+The 3-Clause BSD License:
+
+Copyright (C) 1999-2024 PinMAME development team and contributors
+                        (unless specifically noted differently in a respective source file)
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+
+2. 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.
+
+3. Neither the name of the copyright holder nor the names of its contributors may
+   be used to endorse or promote products derived from this software without specific
+   prior written permission.
+
+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 HOLDER 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.

README.md

@@ -28,3 +28,70 @@ AltsoundPause(true);
 .
 AltsoundShutdown();
 ```
+
+## Building:
+
+#### Windows (x64)
+
+```shell
+platforms/win/x64/external.sh
+cmake -G "Visual Studio 17 2022" -DPLATFORM=win -DARCH=x64 -B build
+cmake --build build --config Release
+```
+
+#### Windows (x86)
+
+```shell
+platforms/win/x86/external.sh
+cmake -G "Visual Studio 17 2022" -A Win32 -DPLATFORM=win -DARCH=x86 -B build
+cmake --build build --config Release
+```
+
+#### Linux (x64)
+```shell
+platforms/linux/x64/external.sh
+cmake -DPLATFORM=linux -DARCH=x64 -DCMAKE_BUILD_TYPE=Release -B build
+cmake --build build
+```
+
+#### Linux (aarch64)
+```shell
+platforms/linux/aarch64/external.sh
+cmake -DPLATFORM=linux -DARCH=aarch64 -DCMAKE_BUILD_TYPE=Release -B build
+cmake --build build
+```
+
+#### MacOS (arm64)
+```shell
+platforms/macos/arm64/external.sh
+cmake -DPLATFORM=macos -DARCH=arm64 -DCMAKE_BUILD_TYPE=Release -B build
+cmake --build build
+```
+
+#### MacOS (x64)
+```shell
+platforms/macos/x64/external.sh
+cmake -DPLATFORM=macos -DARCH=x64 -DCMAKE_BUILD_TYPE=Release -B build
+cmake --build build
+```
+
+#### iOS (arm64)
+```shell
+platforms/ios/arm64/external.sh
+cmake -DPLATFORM=ios -DARCH=arm64 -DCMAKE_BUILD_TYPE=Release -B build
+cmake --build build
+```
+
+#### tvOS (arm64)
+```shell
+platforms/tvos/arm64/external.sh
+cmake -DPLATFORM=tvos -DARCH=arm64 -DCMAKE_BUILD_TYPE=Release -B build
+cmake --build build
+```
+
+#### Android (arm64-v8a)
+```shell
+platforms/android/arm64-v8a/external.sh
+cmake -DPLATFORM=android -DARCH=arm64-v8a -DCMAKE_BUILD_TYPE=Release -B build
+cmake --build build
+```