Added initial files.

examples/resources/images/LICENCE

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+Resource	Author				Licence		Source
+tiles.png	Chris Hamons (maintainer)	CC0		https://opengameart.org/content/dungeon-crawl-32x32-tiles
+apple.png	Jussi Viitala			CC0
+grass.png	Jussi Viitala			CC0
+snake.png	Jussi Viitala			CC0

examples/resources/shaders/glsl100/wave.fs

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+#version 100
+
+precision mediump float;
+
+// Input vertex attributes (from vertex shader)
+varying vec2 fragTexCoord;
+varying vec4 fragColor;
+
+// Input uniform values
+uniform sampler2D texture0;
+uniform vec4 colDiffuse;
+
+uniform float secondes;
+
+uniform vec2 size;
+
+uniform float freqX;
+uniform float freqY;
+uniform float ampX;
+uniform float ampY;
+uniform float speedX;
+uniform float speedY;
+
+void main() {
+    float pixelWidth = 1.0 / size.x;
+    float pixelHeight = 1.0 / size.y;
+    float aspect = pixelHeight / pixelWidth;
+    float boxLeft = 0.0;
+    float boxTop = 0.0;
+
+    vec2 p = fragTexCoord;
+    p.x += cos((fragTexCoord.y - boxTop) * freqX / ( pixelWidth * 750.0) + (secondes * speedX)) * ampX * pixelWidth;
+    p.y += sin((fragTexCoord.x - boxLeft) * freqY * aspect / ( pixelHeight * 750.0) + (secondes * speedY)) * ampY * pixelHeight;
+
+    gl_FragColor = texture2D(texture0, p)*colDiffuse*fragColor;
+}

examples/resources/shaders/glsl330/wave.fs

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+#version 330
+
+// Input vertex attributes (from vertex shader)
+in vec2 fragTexCoord;
+in vec4 fragColor;
+
+// Input uniform values
+uniform sampler2D texture0;
+uniform vec4 colDiffuse;
+
+// Output fragment color
+out vec4 finalColor;
+
+uniform float secondes;
+
+uniform vec2 size;
+
+uniform float freqX;
+uniform float freqY;
+uniform float ampX;
+uniform float ampY;
+uniform float speedX;
+uniform float speedY;
+
+void main() {
+    float pixelWidth = 1.0 / size.x;
+    float pixelHeight = 1.0 / size.y;
+    float aspect = pixelHeight / pixelWidth;
+    float boxLeft = 0.0;
+    float boxTop = 0.0;
+
+    vec2 p = fragTexCoord;
+    p.x += cos((fragTexCoord.y - boxTop) * freqX / ( pixelWidth * 750.0) + (secondes * speedX)) * ampX * pixelWidth;
+    p.y += sin((fragTexCoord.x - boxLeft) * freqY * aspect / ( pixelHeight * 750.0) + (secondes * speedY)) * ampY * pixelHeight;
+
+    finalColor = texture(texture0, p)*colDiffuse*fragColor;
+}