Update deps + Add docs = RC1

src/RethinkDB.DistributedCache/README.md

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+# RethinkDB.DistributedCache
+
+This package provides an [ASP.NET Core cache implementation][cache] backed by [RethinkDB][].
+
+## Quick Start
+
+### C#
+
+```csharp
+using RethinkDB.DistributedCache;
+
+IConnection conn = yourRethinkDBConnection; // set up connection first
+ 
+// within ASP.NET Core service configuration
+builder.Services.AddDistributedRethinkDBCache(opts => opts.Connection = conn);
+
+// it will be used by other processes, such as sessions
+```
+
+### F#
+
+```fsharp
+open RethinkDB.DistributedCache
+
+let conn = yourRethinkDBConnection // set up connection first
+
+// within ASP.NET Core service configuration
+let _ = builder.Services.AddDistributedRethinkDBCache(fun opts ->
+    opts.Connection <- conn)
+
+// it will be used by other processes, such as sessions
+```
+
+## More Information
+
+More information and details can be found at the [project site][].
+
+[cache]: https://docs.microsoft.com/en-us/aspnet/core/performance/caching/distributed
+[RethinkDB]: https://www.rethinkdb.com
+[project site]: https://bitbadger.solutions/open-source/rethinkdb-distributedcache/