Add new color level

    rewrite drawer with SDL_RenderGeometry #1
    rewrite event handler
    add help, version, display, modes

Author: qaqland

Makefile

@@ -1,12 +1,17 @@
 TARGET = display-test
-VERSION = 0.0.1
+VERSION = 0.0.2
+
+SDL2 = $(shell pkg-config --cflags --libs sdl2)
 CFLAGS = -Wall -Wextra -Werror -std=c99
 
-DEPS = $(shell pkg-config --cflags --libs sdl2)
+all: $(TARGET)
+
+$(TARGET): main.c
+	cc -o $@ $< $(SDL2) $(CFLAGS) -DVERSION=\"$(VERSION)\"
 
-all: main.c
-	cc -o $(TARGET) $< $(DEPS) $(CFLAGS) -DVERSION=\"$(VERSION)\"
+.PHONY: clean, install
 
-.PHONY: clean
+install:
+	@echo "Please move $(TARGET) to your PATH **manually**."
 clean:
 	rm -f $(TARGET)

README.md

@@ -1,32 +1,24 @@
 # Display Test
 
+> [!WARNING]  
+> **PHOTOSENSITIVITY/EPILEPSY SEIZURES**
+
 Test your display with colors and lines.
 
-## TODO
+- color pure \* 8
+- color level \* 7
+- lines \* 2
+
+## Usage
 
-- Linux
-  - Wayland
-  - X11
-  - FB
-- mouse support
-  - ~~click~~
-  - wheel
-- ~~CPU cost~~
-- more tests
-  - http://www.lagom.nl/lcd-test/sharpness.php
-  - https://www.color.org/browsertest.xalter
+see `display-test -h`
 
 ## Wayland
 
 ```
 SDL_VIDEODRIVER=wayland ./display-test
 ```
 
-## Keys
-
-- up/down/left/right/space/escape/q(uit)
-- "d" for debug only, no other meaning.
-
 ## Scripts for Development
 
 ```