feat: add font class and render font function

src/shaders/text_f_shader.glsl

@@ -0,0 +1,12 @@
+#version 460
+
+in vec2 texCoord;
+out vec4 color;
+
+layout (binding = 0) uniform sampler2D text;
+uniform vec3 textColor;
+
+void main(void) {
+    vec4 smapled = vec4(1.0, 1.0, 1.0, texture(text, texCoord).r);
+    color = vec4(textColor, 1.0) * smapled;
+}

src/shaders/text_v_shader.glsl

@@ -0,0 +1,11 @@
+#version 460
+
+layout (location = 0) in vec4 vertex;
+out vec2 texCoord;
+
+uniform mat4 projection;
+
+void main(void) {
+    gl_Position = projection * vec4(vertex.xy, 0.0, 1.0);
+    texCoord = vec2(vertex.zw);
+}