Add basic DocC files for modules

Author: Mordil

Sources/RediStack/Documentation.docc/RediStack.md

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+# ``RediStack``
+
+A non-blocking Swift client for Redis built on top of SwiftNIO.
+
+## Overview
+
+**RediStack** is quick to use - all you need is an [`EventLoop`](https://apple.github.io/swift-nio/docs/current/NIO/Protocols/EventLoop.html) from **SwiftNIO**.
+
+```swift
+import NIO
+import RediStack
+
+let eventLoop: EventLoop = ...
+let connection = RedisConnection.make(
+    configuration: try .init(hostname: "127.0.0.1"),
+    boundEventLoop: eventLoop
+).wait()
+
+let result = try connection.set("my_key", to: "some value")
+    .flatMap { return connection.get("my_key") }
+    .wait()
+
+print(result) // Optional("some value")
+```
+
+> Important: Use of `wait()` was used here for simplicity. Never call this method on an `eventLoop`!
+
+## Topics
+
+### Creating Connections
+
+- ``RedisConnection``
+- ``RedisConnectionPool``
+
+### Sending Commands
+
+- ``RedisClient``
+- ``RedisCommand``
+- ``RedisKey``
+
+### Pub/Sub
+
+- ``RedisChannelName``
+
+### Error Handling
+
+- ``RedisError``
+- ``RedisClientError``
+- ``RedisConnectionPoolError``
+
+### Monitoring
+
+- ``RedisMetrics``
+- ``RedisLogging``
+
+### Creating Redis NIO Pipelines
+
+- ``RedisByteDecoder``
+- ``RedisCommandHandler``
+- ``RedisMessageEncoder``
+- ``RedisPubSubHandler``
+
+### Redis Serialization Protocol
+
+- ``RESPTranslator``
+- ``RESPValue``
+- ``RESPValueConvertible``

Sources/RediStackTestUtils/Documentation.docc/RediStacktestUtils.md

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+# ``RediStackTestUtils``
+
+A collection of useful utilities for testing code that interacts with Redis.
+
+## Topics
+
+### Integration Tests
+
+- ``RedisIntegrationTestCase``
+- ``RedisConnectionPoolIntegrationTestCase``