docs(lvl13): adding the english readme

rparodi/level13/README.md

@@ -1,11 +1,11 @@
-Lors de l'arriver sur le level13 je remarque le fichier level13
+When arriving on level13 I notice the file level13.
 
 ```bash
 ls -l level13
 -rwsr-sr-x 1 flag13 level13 7303 Aug 30  2015 level13
 ```
 
-Et je remarque egallement que c'est du C
+And I also notice that it is C.
 ```c
 ltrace ./level13
 __libc_start_main(0x804858c, 1, 0xbffff7f4, 0x80485f0, 0x8048660 <unfinished ...>
@@ -15,16 +15,16 @@ printf("UID %d started us but we we expe"..., 2013UID 2013 started us but we we
 )                       = 42
 exit(1 <unfinished ...>
 +++ exited (status 1) +++
-
 ```
 
-en le lancant (plus proprement), il attente l'UID 4242
+By launching it (more cleanly), it expects the UID 4242.
 ```bash
-level13@SnowCrash:~$ ./level13
+./level13
 UID 2013 started us but we we expect 4242
 ```
 
-Voici le code de la fonction main
+Here is the code of the main function.
+
 ```asm
 0804858c <main>:
  804858c:	55                   	push   ebp
@@ -59,13 +59,13 @@ Voici le code de la fonction main
  80485ef:	90                   	nop
 ```
 
-Notamment cette ligne (7) qui vas nous interesser
+Notably this line (7) which will interest us.
 ```asm
 804859a:    cmp    eax,0x1092
 ```
 
-0x1092 = 0d4242
-il suffit de changer la valeur de notre uid lors de la comparaison (a l'aide de gdb)
+0x1092 = 0d4242.
+It is enough to change the value of our uid during the comparison (with the help of gdb).
 ```asm
 (gdb) b main
 Breakpoint 1 at 0x804858f