Add the example of Selector in Nacos 2.0.4#69

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brotherlu-xcq wants to merge 3 commits intonacos-group:masterfrom brotherlu-xcq:fix-#66

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Commits on Sep 9, 2021

[ISSUE nacos-group#66 ] add the example of Selector in Nacos 2.x.
brotherlu-xcq
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Commits on Oct 11, 2021

[ISSUE nacos-group#66 ] add TagSelector example.
brotherlu-xcq
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Commits on Jan 18, 2022

[ISSUE nacos-group#66 ] change the version.
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