Add German Mac keylayout

[compensis]

Add German Mac keylayout.

I have tested this on a German Apple MacBook Air running macOS Sequoia 15.4.1.

Terminal output:

--- HID Project Keyboard Layout Test ---
You will see two columns of characters. If the chosen keymap is correct, the two characters
will be the same on every line. If they are not, try again with a different keymap.
DO NOT CHANGE WINDOW UNTIL THE SKETCH IS DONE!!!
Please click in the input box above, make sure it is empty and press ENTER
    OK
! ! OK
" " OK
# # OK
$ $ OK
% % OK
& & OK
' ' OK
( ( OK
) ) OK
* * OK
+ + OK
, , OK
- - OK
. . OK
/ / OK
0 0 OK
1 1 OK
2 2 OK
3 3 OK
4 4 OK
5 5 OK
6 6 OK
7 7 OK
8 8 OK
9 9 OK
: : OK
; ; OK
< < OK
= = OK
> > OK
? ? OK
@ @ OK
A A OK
B B OK
C C OK
D D OK
E E OK
F F OK
G G OK
H H OK
I I OK
J J OK
K K OK
L L OK
M M OK
N N OK
O O OK
P P OK
Q Q OK
R R OK
S S OK
T T OK
U U OK
V V OK
W W OK
X X OK
Y Y OK
Z Z OK
[ [ OK
\ \ OK
] ] OK
^ ^ OK
_ _ OK
` ` OK
a a OK
b b OK
c c OK
d d OK
e e OK
f f OK
g g OK
h h OK
i i OK
j j OK
k k OK
l l OK
m m OK
n n OK
o o OK
p p OK
q q OK
r r OK
s s OK
t t OK
u u OK
v v OK
w w OK
x x OK
y y OK
z z OK
{ { OK
| | OK
} } OK
~ ~ OK
--- Done ---