Add CodeLens support in XML features docs #562
Description
In https://github.com/redhat-developer/vscode-xml/blob/master/docs/Features/XMLFeatures.md add Codelens support and a subsection about Codelens Bind grammar/schema
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In https://github.com/redhat-developer/vscode-xml/blob/master/docs/Features/XMLFeatures.md add Codelens support and a subsection about Codelens Bind grammar/schema