Reorganize the structure of the code folder

Code/NES/README.md

@@ -0,0 +1,28 @@
+# How to compile NES emulator
+```bash
+git clone https://github.com/shapoco/shapones.git
+
+cd shapones
+git apply shapones.patch
+cd samples/v3/
+mkdir build
+cd build
+export PICO_SDK_PATH=/to/where/your/pico/sdk/is
+cmake ..
+make
+```
+
+Copy picocalc_nes.uf2 into picocalc
+
+use up/down key to select *.nes rom, 
+* \- key is select
+* = key is start,
+* [ key is a 
+* ] key is b
+
+press -(select) and =(start) together, will reset the emulator to the rom selection page.
+
+Due to the limitation of Pico memory, only ROMs with a size less than or equal to **44KB** can be used.
+
+
+