Add RenderParams constructor

src/fart/RenderParams.cpp

@@ -0,0 +1,7 @@
+#include <fart/RenderParams.h>
+
+RenderParams::RenderParams()
+{
+    width = 800;
+    height = 600;
+}

src/fart/RenderParams.h

@@ -6,4 +6,6 @@ struct RenderParams
 {
     size_t width = 0u;
     size_t height = 0u;
+
+    RenderParams();
 };