test: add test data

data/test_assets/dummytext

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+The quick brown fox jumps over the lazy dog

data/test_assets/triangle.frag

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+#version 450 core
+
+layout(location = 0) in vec3 in_frag_color;
+
+layout(location = 0) out vec4 out_frag_color;
+
+void main()
+{
+	out_frag_color =  vec4(in_frag_color, 1.0);
+}

data/test_assets/triangle.vert

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+#version 450 core
+
+vec2 positions[3] = vec2[](
+    vec2(0.0, -0.5),
+    vec2(0.5, 0.5),
+    vec2(-0.5, 0.5)
+);
+
+vec3 colors[3] = vec3[](
+    vec3(1.0, 0.0, 0.0),
+    vec3(0.0, 1.0, 0.0),
+    vec3(0.0, 0.0, 1.0)
+);
+
+layout(location = 0) out vec3 out_frag_color;
+
+void main() 
+{
+    gl_Position = vec4(positions[gl_VertexIndex], 0.0, 1.0);
+    out_frag_color = colors[gl_VertexIndex];
+}