move exercises and lectures into subfolders

Lectures/LC21/Simple/simple.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <stdlib.h>   
+
+/* Note the new type of main */
+
+int main(int argc, char *argv[])
+{ 
+     int x; 
+     
+     /* Print the argument count */
+     printf("Arguments -> %d\n",argc); 
+     
+     /* And the arguments themselves */
+     for (x=0; x<argc; x++) 
+        printf("%s\n",argv[x]);        
+        
+     return 0;
+} 
+