M2351: Add license file for default secure library/executable

targets/TARGET_NUVOTON/TARGET_M2351/TARGET_NUMAKER_PFM_M2351/TARGET_M23_NS/LICENSE

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+Permissive Binary License
+
+Version 1.0, September 2015
+
+Redistribution.  Redistribution and use in binary form, without
+modification, are permitted provided that the following conditions are
+met:
+
+1) Redistributions must reproduce the above copyright notice and the
+   following disclaimer in the documentation and/or other materials
+   provided with the distribution.
+
+2) Unless to the extent explicitly permitted by law, no reverse
+   engineering, decompilation, or disassembly of this software is
+   permitted.
+
+3) Redistribution as part of a software development kit must include the
+   accompanying file named "DEPENDENCIES" and any dependencies listed in
+   that file.
+
+4) 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. 
+
+Limited patent license. The copyright holders (and contributors) grant a
+worldwide, non-exclusive, no-charge, royalty-free patent license to
+make, have made, use, offer to sell, sell, import, and otherwise
+transfer this software, where such license applies only to those patent
+claims licensable by the copyright holders (and contributors) that are
+necessarily infringed by this software. This patent license shall not
+apply to any combinations that include this software.  No hardware is
+licensed hereunder.
+
+If you institute patent litigation against any entity (including a
+cross-claim or counterclaim in a lawsuit) alleging that the software
+itself infringes your patent(s), then your rights granted under this
+license shall terminate as of the date such litigation is filed.
+
+DISCLAIMER. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+CONTRIBUTORS "AS IS." 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
+HOLDERS 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.

targets/TARGET_NUVOTON/TARGET_M2351/TARGET_NUMAKER_PFM_M2351/TARGET_M23_NS/README.md

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+# Default secure code for M2351
+
+The M2351 is a TrustZone target that requires two codes: secure and nonsecure. Secure code runs first to set up the secure environment and then brings up the nonsecure code. `NuMaker-mbed-TZ-secure-example.hex` is the default secure code, and `cmse_lib.o` is its accompanying
+secure gateway library, which exports secure functions to nonsecure code. It is built from the [secure code template](https://github.com/OpenNuvoton/NuMaker-mbed-TZ-secure-example). Because secure and nonsecure code may start at an address other than `0x0`, we have chosen `.hex` rather than `.bin` as the output format.
+
+## Hardware partition
+
+On TrustZone targets, you need to partition the hardware first for secure code to run on secure worlds and nonsecure code to run on nonsecure worlds.
+
+The default secure code has the following hardware partition:
+
+- Flash (512KiB in total): 256KiB for secure and 256KiB for nonsecure.
+- SRAM (96KiB in total): 32KiB for secure and 64KiB for nonsecure.
+- Peripherals: Most are configured to nonsecure except the following, which are hardwired or reserved:
+    - **SYS/CLK** hardwired to secure. Accessible to nonsecure through a secure gateway.
+    - **FMC** hardwired to secure. Accessible to nonsecure through a secure gateway.
+    - **WDT** hardwired to secure. Accessible to nonsecure through a secure gateway.
+    - **RTC** configured to secure. Accessible to nonsecure through a secure gateway.
+    - **TMR0/1** hardwired to secure. TMR0 implements secure `us_ticker`, and TMR1 implements secure `lp_ticker`.
+    - **TMR2/3** configured to nonsecure. TMR2 implements nonsecure `us_ticker`, and TMR3 implements nonsecure `lp_ticker`.
+    - **PDMA0** hardwired to secure. Implements secure asynchronous transfer.
+    - **PDMA1** configured to nonsecure. Implements nonsecure asynchronous transfer.
+
+## Flash secure and nonsecure code
+
+To flash secure and nonsecure code on the M2351, drag-and-drop `NuMaker-mbed-TZ-secure-example.hex` first, and then build the user program, for example, [mbed-os-example-blinky.hex](https://github.com/ARMmbed/mbed-os-example-blinky).
+
+## Reference
+
+Please refer to the [secure code template](https://github.com/OpenNuvoton/NuMaker-mbed-TZ-secure-example) for details.