add README and ECLinclude

ECLinclude/ECLplus.eclm

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+!eclmap
+!ins_names
+2000 msgf
+2001 printf
+2002 cls
+2003 drawf
+2004 drawColor

ECLinclude/ECLplus.tecl

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+#eclmap "ECLplus.eclm"
+#ins "2000 m*D"
+#ins "2001 m*D"
+#ins "2002"
+#ins "2003 mff*D"
+#ins "2004 S"

README.md

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+# ECLplus
+ECLplus is a modification for Touhou 17 - Wily Beast and Weakest Creature. It's main goal is adding more instructions for ECL scripts.
+
+## Usage
+### Installation
+Put `ECLPLUS.dll` and `ECLplusLoader.exe` in the folder where `th17.exe` is located, and launch the game by using the loader. If you wish to use thcrap, you can change `th17.exe` in `games.js` to `ECLplusLoader.exe` and it will just work. If everything went correctly, a console with a message from ECLplus will start alongside the main game window (small note: with thcrap console enabled, both ECLplus and thcrap will end up outputting to the same console, and the ECLplus message will get burried under a massive amount of thcrap logs).
+
+### Using custom instructions
+In your ECL source file, `#include` the `ECLplus.tecl` script from the `ECLinclude` directory in order to get instruction names and definitios of ECLplus. Then, you can use the new instructions freely.
+
+## Instruction list
+- `msgf(string format, ...)` - shows a printf-formatted message box. Example: `msgf("Hello from ECL! My id is %d", _SS ID)` (note that since this uses the `D` param type for extra parameters, prefixing with typecast is necessary as of current thecl version).  
+- `printf(string format, ...)` - prints a printf-formatted string in the console, same concept as the instruction above.
+- `cls()` - clears the console.
+- `drawf(string format, float x, float y, ...)` - draws a printf-formatted string on the given coordinates in the game window (ECL coordinate system). Top-left corner of the string corresponds to the coordinates given. It will only be drawn for 1 frame, in order to keep it displayed all the time `drawf` needs to be in a loop.
+- `drawColor(int c)` - sets color of strings drawn by `drawf`. Example: `drawColor(0xFF00FF00)` sets color to green. The order is reversed (ABGR), so this has alpha value of `FF`, blue value of `00`, green value of `FF` and red value of `00`.