docs: add docs/

docs/apt.md

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+# apt.h
+"Applet service." To use everything the 3DS can do.
+
+## `bool aptMainLoop(void);`
+Handle sleep mode and HOME/power buttons, call it at the beginning of
+each frame.
+If it returns false, that means the program should return.

docs/console.md

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+# console.h
+
+## `void consoleInit(gfxScreen_t screen, NULL);`
+Show the (default) console on the specified screen.
+Apparently no need for any gfx function.
+
+## `void consoleClear(void);`
+Clear the console.
+
+## CONSOLE_*
+CONSOLE_ESC(x): use ASCII escape code. ("\e[" + x)
+CONSOLE_RESET: reset font style.
+CONSOLE_{BLACK|RED|GREEN|YELLOW|BLUE|MAGENTA|CYAN|WHITE}: use a specific color.

docs/gfx.md

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+# gfx.h
+Screen buffers for graphice.
+
+
+## `void gfxInitDefault(void);`
+Initialize LCD framebuffers with default parameters:
+    gfxInit(GSP_BGR8_OES,GSP_BGR8_OES,false);
+Internally calls `gspInit()`.
+
+## `void gfxExit(void);`
+Destroy everything gfx-related.
+
+## `void gfxFlushBuffers(void);`
+Draw the buffer.
+
+## `void gfxSwapBuffers(void);`
+??? idk call it after gfxFlushBuffer().
+
+## `enum gfxScreen_t;`
+Represents each screen.
+- GFX_TOP: Top screen.
+- GFX_BOTTOM: Bottom screen.
+## `enum gfx3dSide_t;`
+Represent each image for the 3D screen.
+GFX_LEFT: Left eye.
+GFX_RIGHT: Right eye.

docs/gspgpu.md

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+# gspgpu.h
+Graphical things.
+
+## `void gspWaitForVBlank(void);`
+Wait for the vertical sync to be done??? idk just call it before drawing
+anything (TODO visual)
+
+## Resolutions
+GSP_SCREEN_WIDTH: Width of both screens (240).
+GSP_SCREEN_HEIGHT_TOP: Height of the top screen (400).
+GSP_SCREEN_HEIGHT_TOP_2X: Height of the top screen times 2 (800).
+GSP_SCREEN_HEIGHT_TOPBOTTOM: Height of the bottom screen (320).

docs/hid.md

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+# hid.h
+Self-explanatory lol
+
+## BASE
+
+### `Result hidInit(void);`
+Inilialize HID.
+
+### `void hidExit(void);`
+Exit HID.
+
+### `void hidScanInput(void);`
+Check the status of each button. Must be called before hidKeys*().
+
+## BUTTONS
+
+### `u32 hidKeys*(void);`
+Test a certain condition and return a u32 containing the boolean state for each
+button. (TODO visual)
+Use `hidKey*() & KEY_*` to have the boolean value for a specific button.
+- `u32 hidKeysHeld();`
+True if the key is currently pressed.
+- `u32 hidKeysDown();`
+True if the key has just been pressed. (TODO not only once?)
+- `u32 hidKeysDownRepeat();`
+TODO
+- `u32 hidKeysUp();`
+True if the key has just been released.
+
+### KEY_*
+Simple buttons:
+- KEY_{A|B|X|Y}: A/B/X/Y buttons.
+- KEY_{SELECT|START}: Select/Start buttons.
+- KEY_{L|R}: L/R buttons.
+Directions:
+- KEY_D{RIGHT|LEFT|UP|DOWN}: D-Pad directions.
+- KEY_CPAD_{RIGHT|LEFT|UP|DOWN}: Circle Pad directions.
+- KEY_{UP|DOWN|LEFT|RIGHT}: Catch Circle Pad and D-Pad at the same time.
+New 3DS only:
+- KEY_{ZL|ZR}: ZL/ZR buttons (New 3DS only)
+- KEY_CSTICK{RIGHT|LEFT|UP|DOWN}: C-Stick directions (New 3DS only)
+Uh?
+- KEY_TOUCH: (Not implemented? TODO)
+
+## TOUCH SCREEN
+
+### `void hidTouchRead(touchPosition *dest);`
+Read the current touch position.
+
+### `typedef touchPosition;`
+```c++
+typedef struct {
+    u16 px;
+    u16 py;
+} touchPosition;
+```
+
+## TOUCH SCREEN
+
+### `void hidCircleRead(circlePosition *dest);`
+Read the current circle pad position.
+
+### `typedef circlePosition;`
+```c++
+typedef struct {
+    u16 dx;
+    u16 dy;
+} circlePosition;
+```