You asked

Is the leica macro elmar m 90mm f 4 good for macro photography?

Yes, I think it's a good choice for macro, with one caveat: it's a manual-focus lens with no stabilisation, so you'll be focusing by eye and holding steady. Close-up work is slow anyway, so that suits it. A tripod helps a lot at close range, where the smallest shake shows up.

It's a 90mm on full frame, a focal length that gives you room to work at close distances without crowding your subject. It's also collapsible and light, so it won't weigh down a bag you're carrying all day. It fits any Leica M body, and I'd start with these:

The lens's own page has the full details: Leica Macro-Elmar-M 90mm f/4.

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