Document Waku existing light node behavior about rfc HOT 8 CLOSED

@decanus do you want to take a look at this one?

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So I added light node description in specs/light-node. This documents both the behaviour in geth and nimbus which are identical. Its rather simple, one thing left to look at is the handshake. Would also make sense to discuss with core to see which functionality is used in the app.

cc @kdeme

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@decanus Seems like this is modifying the existing waku spec, can we add it to existing PR? It'll get messy quickly if we have too many branches IMO.

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@oskarth I can just merge it yea.

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Important to note that status clients run in light mode.

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Current docs https://github.com/status-im/specs/blob/master/status-client-spec.md#mobile-nodes

Note inconsistent terms and different MUST/MAY usage cc @adambabik

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@decanus what's state of this?

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Although compact, seems good imo: https://github.com/vacp2p/specs/blob/master/waku.md#light-node

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