Add references to the repository.

tests/good/add-sub.ref

+2097
+2097
+-2097
+-2097
+-2097
+2097
+2097
+2097

tests/good/and-or-nor-xor.ref

+2097
+2097
+2097
+2097
+-1
+-2
+-2
+-2
+2097
+0
+255

tests/good/extended-euclide.ref

+   x	|   y	|   g	|   u	|   v	|   w	|   q
+   1	|   0	|   101	|   0	|   1	|   17	|   5
+   0	|   1	|   17	|   1	|   -5	|   16	|   1
+   1	|   -5	|   16	|   -1	|   6	|   1	|   16
+-1
+6

tests/good/fact.ref

+3628800

tests/good/gtcd.ref

+    a	|   b	| a mod b
+---------------------------
+   2097	|   42	|   39
+   42	|   39	|   3
+   39	|   3	|   0
+3

tests/good/modular-exponent.ref

+   e_i	|   h	|   g
+------------------------
+   1	|   8	|   7
+   1	|   18	|   11
+   1	|   8	|   7
+   0	|   8	|   11
+   1	|   12	|   7
+12

tests/good/neg.ref

+-2097
+-2097
+-2147483648

tests/good/not.ref

+16711861

tests/good/print.ref

+There is no gravity.

tests/good/print_int.ref

+2097
\ No newline at end of file

tests/good/read_int.ref

+2097

tests/good/seq-sne.ref

+1
+1
+0
+0
+0
+0
+1
+1

tests/good/shift.ref

+-8192
+-4096
+-2048
+-1024
+-512
+2047
+4095

tests/unlimited/simple-exp.ref

+93
+2004