Add print string from memory interrupt

bin/example.wasm

@@ -15,7 +15,7 @@ addi $1 %A %A;
 # Print the current value
 int $1;
 seti %B %A;
-seti %A $10; # new line
+seti %A $32; # space
 int $0;
 seti %A %B;
 
@@ -68,3 +68,19 @@ int $0;
 
 seti %A [$1024];
 int $1;
+
+# Push the string "hell" into register A
+seti %A $108;
+shli %A $8 %A;
+addi %A $108 %A;
+shli %A $8 %A;
+addi %A $101 %A;
+shli %A $8 %A;
+addi %A $104 %A;
+
+# Store A at 900
+seti [$900] %A;
+# Setup to print a string from position 900
+seti %A $900;
+seti %B $4;
+int $2;