Create README.md

Author: sumanthdosapati

Specialized Areas/Regular Expressions/Validate IPv6 Address/README.md

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+# IPv6 Address Validator
+
+This snippet validates **IPv6 addresses** in both full and compressed formats using JavaScript regex.
+
+### Features
+- Supports full and shortened IPv6 formats (`::` compression)
+- Validates loopback (`::1`) and link-local (`fe80::`) addresses
+- Rejects invalid hex groups and multiple `::`
+