Add Dockerfile

Dockerfile

+From ubuntu:20.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get update -y && \
+    apt-get install -y libjpeg-dev && \
+    apt-get install -y libfreetype-dev && \
+    apt-get install -y libfontconfig-dev && \
+    apt-get install -y libgl1-mesa-dev && \
+    apt-get install -y mesa-common-dev
+
+CMD "/bin/bash"

src/canvas.h

 
+#include <memory>
+
 #ifndef CANVAS_H
 #define CANVAS_H
 
@@ -7,6 +9,7 @@ enum PixelTypes {};
 class Canvas {
 public:
     Canvas(int width, int height, PixelTypes pixType);
+
 };
 
 #endif /* CANVAS_H */