rtos: add license information

Author: 0xc0170

rtos/LICENSE-mit.txt

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+MIT License
+
+Copyright (c) 2019 Arm Limited and affiliates.
+
+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.

rtos/LICENSE.md

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+Unless specifically indicated otherwise in a file or in the list below, files are licensed under the Apache 2.0 license,
+as can be found: LICENSE-apache-2.0.txt.
+
+Files licensed under MIT.
+
+TARGET_CORTEX/mbed_rtos1_types.h
+TARGET_CORTEX/mbed_rtos_storage.h
+TARGET_CORTEX/mbed_rtx_conf.h
+TARGET_CORTEX/mbed_rtx_idle.cpp
+TARGET_CORTEX/SysTimer.h
+TARGET_CORTEX/SysTimer.cpp
+ConditionVariable.cpp
+ConditionVariable.h
+EventFlags.cpp
+EventFlags.h
+Kernel.cpp
+Kernel.h
+Mail.h
+MemoryPool.h
+Mutex.cpp
+Mutex.h
+Queue.h
+rtos.h
+rtos_handlers.h
+rtos_idle.h
+RtosTimer.cpp
+RtosTimer.h
+Semaphore.cpp
+Semaphore.h
+ThisThread.cpp
+ThisThread.h
+Thread.cpp
+Thread.h