add mips assembly

a/assembler_mips.asm

@@ -0,0 +1,9 @@
+.data
+    hw:        .asciiz        "Hello, World!"
+.text
+main:
+    la $a0, hw           #load the address of hw into $a0
+    li $v0, 4            #load 4 into $v0
+    syscall              #perform the print_string syscall
+    li $v0, 10           #load 10 into $v0
+    syscall              #perform the exit syscall