Add documentation index

Author: ecnepsnai

Sources/DNSKit/Docs.docc/index.md

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+# ``DNSKit``
+
+An asynchronous DNS library for Swift.
+
+DNSKit provides a wide array of support across the DNS ecosystem, including:
+
+- Native support for most common DNS record types.
+- Support for DNS over HTTPS, DNS over TLS, DNS over Quic, and traditional DNS using TCP or UDP.
+- Full DNSSEC signature validation & chain trust establishment.
+- WHOIS client for domain information.
+
+## Getting Started
+
+Use the initalizer to the Query class, ``Query/init(transportType:transportOptions:serverAddresses:recordType:name:queryOptions:)``,
+to define your query, the DNS server to use, and to execute your query and get the response.
+
+### WHOIS
+
+Use the ``WHOISClient/lookup(_:)`` class to perform WHOIS lookups
+
+### DNSSEC
+
+Re-using the same query you used to perform your query, call ``Query/authenticate(message:)``. Be sure that ``QueryOptions/dnssecRequested``
+was set to true in your original query.