Add MBR version

No need for a 1.41 MiB `.img` `:P`

e.mbr.asm

@@ -0,0 +1,31 @@
+bits 16
+org 0x7C00
+
+_start:
+    ; enable cursor
+    xor cx, cx
+    mov ch, 00100000b
+    mov ah, 1
+    int 0x10
+    
+    ; move cursor to top
+    xor dx, dx
+    xor bx, bx
+    inc ah
+    int 0x10
+    
+    ; print 1 char
+    mov ax, 'e'|(0x0E<<8)
+ .loop:
+    int 0x10
+    jmp short .loop
+
+END:
+    times 0x200-2-(END-_start) db 'e'
+    db 0x55,0xAA
+    
+stack:
+
+%if END-_org > 0x200-2
+%error "Not enough space!"
+%endif