rainbowhat - Update README.md

[adkl]

• Register Bmx280 temperature sensor before registering dynamic sensor callback

Based on my experience and also a discussion from #103, maybe it should be useful to state this important block of code in the docs.

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[adkl]

@googlebot I signed it!

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[devunwired]

Thanks for noticing this.
We need to separate the blocks of code a bit more, as these two things are not necessarily expected to happen in the same scope (see the example above it for input drivers). There should be a separate block for the code you added with a comment about registering the listener in your activity.

[adkl]

I agree, now it looks more convenient.