Move summary of logging libraries from Logging2 README (#1)

Author: c42f

src/index.md

@@ -2,9 +2,50 @@
 
 This is the landing page of the [JuliaLogging GitHub organization](https://github.com/JuliaLogging/).
 JuliaLogging is an umbrella organization for logging-related packages and repositories
-of [Julia programming language](https://julialang.org/) ecosystem.
+in the [Julia programming language](https://julialang.org/) ecosystem.
 
-JuliaLogging is the home for the following packages and repositories:
+Here's a summary of libraries which integrate with the standard logging
+frontend macros `@debug`, `@info`, `@warn`, `@error` from `Base` and with the
+abstractions from the
+[`Logging`](https://docs.julialang.org/en/v1/stdlib/Logging) standard library.
+
+### Frontend
+
+* [`ProgressLogging.jl`](https://github.com/JuliaLogging/ProgressLogging.jl)
+  provides some convenient frontend macros including `@progress` which makes it
+  easy to emit log records tracking the progress of looping constructs.
+
+### Log Event routing and transformation
+
+* [`LoggingExtras.jl`](https://github.com/JuliaLogging/LoggingExtras.jl) provides
+  generic log transformation, filtering and routing functionality. You can use
+  this to mutate messages as they go through the chain, duplicate a stream of
+  log records into multiple streams, discard messages based on a predicate, etc.
+* [`Logging2.jl`](https://github.com/JuliaLogging/Logging2.jl) provides
+  utilities to redirect
+
+### Sinks
+
+* The [`Logging`](https://docs.julialang.org/en/v1/stdlib/Logging) stdlib
+  provides a default logger backend `ConsoleLogger` for basic filtering and
+  pretty printing of log records in the terminal.
+* [`TerminalLoggers.jl`](https://github.com/JuliaLogging/TerminalLoggers.jl) is a
+  library for advanced terminal-based pretty printing of log records, including
+  fancy progress bars and markdown formatting.
+* [`TensorBoardLogger.jl`](https://github.com/PhilipVinc/TensorBoardLogger.jl)
+  can log structured numeric data to
+  [TensorBoard](https://www.tensorflow.org/tensorboard) as a backend.
+* [`LogRoller.jl`](https://github.com/JuliaLogging/LogRoller.jl) has a backend for
+  rotating log files once they hit a size limit.
+* [`Syslogging.jl`](https://github.com/JuliaLogging/SyslogLogging.jl) provides a
+  backend to direct logs to syslog.
+* [`LoggingExtras.jl`](https://github.com/JuliaLogging/LoggingExtras.jl) provides a
+  simple `FileLogger` sink.
+* [LokiLogger](https://github.com/JuliaLogging/LokiLogger.jl) is a log message
+  sink for [Grafana Loki](https://grafana.com/oss/loki/)
+
+### Configuration
+
+* [`LogCompose.jl`](https://github.com/JuliaLogging/LogCompose.jl) provides
+  declarative logger configuration and an associated `.toml` file format.
 
-* [LoggingExtras](https://github.com/JuliaLogging/LoggingExtras.jl) -- extensions to the Logging stdlib
-* [LokiLogger](https://github.com/JuliaLogging/LokiLogger.jl) -- log message sink for [Grafana Loki](https://grafana.com/oss/loki/)