Added LICENSE and README.

Signed-off-by: Yilin Sun <imi415@imi.moe>

LICENSE

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+Copyright 2023 Yilin Sun
+
+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.

README.md

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+# MicroPython ATE Shield
+![Rev. A0 PCB](assets/SMT.webp)
+
+## Why
+
+This board is created trying to solve the following problem in MicroPython project:
+
+> What if the code compiles, but does not work as intended?
+
+So an idea came up by @robert-hh, that we can make these testes automated with a "shield" (See [here](https://github.com/micropython/micropython/pull/11516))
+
+Some peripherals *CAN* be verified by connecting to itself, such as UART and GPIO, while others can't be easily verified without some on-board devices like sensors or EEPROMs. So instead of mounting all sensors on a board, a cheap MCU is used to *act like* some peripherals, which can produce controllable and repeatable results to DUT.
+
+This board can be used to verify the following peripheral drivers:
+
+* ADC
+* UART
+* SPI
+* I2C
+* PWM
+* GPIO
+
+## LPC804
+Why LPC804?
+
+* Cheap enough
+* Fully 5V IO tolarent
+* Has an DAC(!)
+* Switch Matrix