lex and flex syntax highlighting

Language extension to highlight lex and flex files based on:

Name		Name	Last commit message	Last commit date
Latest commit History 2 Commits
syntaxes		syntaxes
.gitignore		.gitignore
README.md		README.md
language-configuration.json		language-configuration.json
package.json		package.json
vsc-extension-quickstart.md		vsc-extension-quickstart.md

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