Update README.md

Added more detailed description what this package does.

Author: FlashSystems

README.md

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 # LDIF-Syntax
-LDIF syntax highlighter and snippets for Sublime Text 3
+LDAP Data Interchange Format syntax highlighter and snippets for Sublime Text 3. Syntax highlighting and checking is done in conformance with the definitions of RFC 2849. IThe syntax highlighter distinguishes between plain text and base64 encoded attribute values. Within both types invalid characters are automatically highlighted.
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+## Snippets
+This package contains snippets for the LDAP modify operations defined by RFC 2849. It's also trying to detect erroneous modify definnitions and highlights them as well.