added declared methods to readme

README.md

@@ -9,6 +9,37 @@ An easy to use image creation tool for C.
 * Colors with transparency
 * draw on individual pixels
 
+## Available methods:
+```c
+// basic image operations
+int image_new(int width, int height, Image* image);
+
+int image_set_px(Image image, int x, int y, int r, int g, int b);
+int image_set_px_c(Image image, int x, int y, Color color);
+
+int image_destroy(Image image);
+
+// colors
+Color color_new(int r, int g, int b);
+Color color_new_alpha(int r, int g, int b, float alpha);
+
+Color color_mix(Color c1, Color c2, float ratio);
+
+void print_color(Color c);
+
+// drawing shapes
+int image_draw_rect(Image image, int x1, int y1, int x2, int y2, Color color);
+int image_draw_circ(Image image, int x, int y, int r, Color color);
+int image_draw_square(Image image, int x, int y, int s, Color color);
+
+
+
+// bmp format specifics:
+int image_save_bmp(Image image, char* path);
+
+
+```
+
 ## Might be added later
 
 * draw lines
@@ -18,4 +49,5 @@ An easy to use image creation tool for C.
 
 ## Performance
 
-While perfomance is not through the roof, creating a 4k image with a simple color gradient takes about 1.5s on a mobile ryzen 5 chip. Smaller graphics (like the transparency demo) are drawn and saved within 20ms, so that's okay, I guess...
+While perfomance is not through the roof, creating a 4k image with a simple color gradient takes about 1.5s on a mobile ryzen 5 chip. Smaller graphics (like the transparency demo) are drawn and saved within 20ms, so that's okay, I guess...
+