[apps/code] Add a model program

Change-Id: I79b74f1f245d98d1ce02a590ee25de2c4fbb3c59

apps/code/program.h

@@ -0,0 +1,22 @@
+#ifndef CODE_PROGRAM_H
+#define CODE_PROGRAM_H
+
+#include <escher.h>
+
+namespace Code {
+
+class Program {
+public:
+  Program();
+  const char * readOnlyContent() const;
+  char * editableContent();
+  void setContent(const char * program);
+private:
+  constexpr static int k_bufferSize = 1024;
+  char m_buffer[k_bufferSize];
+};
+
+}
+
+#endif
+