Add juce READMEs

libs/juce-current/source/README.md

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+# The JUCE Library
+
+**The JUCE fork provided by this repository uses GPLv3 license.  
+See [GNU General Public License v.3](https://www.gnu.org/licenses/gpl-3.0.en.html)
+for more details.**
+
+JUCE is an open-source cross-platform C++ application framework used for rapidly
+developing high quality desktop and mobile applications, including LV2, VST, AU (and AUv3),
+RTAS and AAX audio plug-ins.
+
+JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
+EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE, ARE DISCLAIMED.
+
+The core JUCE modules (juce_audio_basics, juce_audio_devices, juce_blocks_basics, juce_core
+and juce_events) are permissively licensed under the terms of the
+[ISC license](http://www.isc.org/downloads/software-support-policy/isc-license/).
+Other modules are covered by the
+[GNU General Public License v.3](https://www.gnu.org/licenses/gpl-3.0.en.html).

libs/juce-legacy/source/README.md

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+# The JUCE 5 Library
+
+**The JUCE fork provided by this repository uses GPLv3 license.
+See [GNU General Public License v.3](https://www.gnu.org/licenses/gpl-3.0.en.html)
+for more details.**
+
+JUCE is an all-encompassing C++ framework for developing cross-platform
+software. JUCE is used by hundreds of companies to develop powerful,
+cross-platform audio, interactive, embedded or graphic applications.
+
+JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
+EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE, ARE DISCLAIMED.
+
+The juce_audio_basics, juce_audio_devices, juce_blocks_basics, juce_core and
+juce_events modules are permissively licensed under the terms of the [ISC
+license](http://www.isc.org/downloads/software-support-policy/isc-license).
+
+For more information, visit the website:
+[www.juce.com](https://www.juce.com)