📝 Added sandbox (code sketchbook)

sandbox/invoke.c

@@ -0,0 +1,9 @@
+#include <unistd.h>
+
+int
+main(void)
+{
+    /* the execl function is further described in the man pages, but is placed here essentially to exemplify how to invoke a command from within a c program */
+   execl("/usr/bin/st", "my terminal", NULL);
+   return 0;
+}