Update README for rig 0.6.0

[ci skip]

README.md

@@ -17,18 +17,28 @@ Install, remove, configure R versions.
 
 ## 🚀  Features <a id="id-features">
 
-- Works on macOS, Windows and Linux (Ubuntu LTS and Debian, x86_64 and
- aarch64).
+- Works on macOS, Windows and Linux.
+- Supports many Linux distributions, see [list
+ below](#supported-linux-distributions).
 - Easy installation and update, no system requirements on any platform.
 - Install multiple R versions.
 - Select the default R version, for the terminal and RStudio.
 - Select R version to install using symbolic names: `devel`, `next`,
  `release`, `oldrel`, etc.
+- List R versions available to install.
 - Run multiple versions *at the same* time using quick links. E.g.
  `R-4.1` or `R-4.1.2` starts R 4.1.x. Quick links are automatically
  added to the user’s path.
-- On M1 macs select between x86_64 and arm64 versions or R, or install
- both.
+- On macOS it comes with a menu bar app that shows the default R version
+ and lets to select it interactively. [See
+ below](#id-macos-menu-bar-app).
+- On arm64 macs select between x86_64 and arm64 versions or R, or
+ install both.
+- Sets up the default CRAN mirror and
+ [PPM](https://packagemanager.posit.co/).
+- Installs [pak](https://pak.r-lib.org) and set up automatic [system
+ requirements
+ installation](https://pak.r-lib.org/dev/reference/sysreqs.html).
 - Creates and configures user level package libraries.
 - Restricts permissions to the system library. (On macOS, not needed on
  Windows and Linux).
@@ -38,13 +48,12 @@ Install, remove, configure R versions.
 - Installs the appropriate Rtools versions on Windows and sets them up.
 - Cleans up stale R-related entries from the Windows registry.
 - Switches to root/administrator user as needed.
+- Supports JSON output for scripting.
 
 ## 🐞  Known Issues <a id="id-known-issues">
 
 - On macOS, R.app often does not work if you install multiple R
  versions.
-- On Windows you need to restart your shell or terminal after installing
- Rtools, for the changes to take effect.
 - On Windows, `rig rstudio` changes the R version in the registry
  temporarily before starting RStudio and then changes it back after a
  short wait. If RStudio starts up very slowly, then the wait might be
@@ -145,15 +154,20 @@ If you are running Linux on arm64, download the arm64 build:
  curl -Ls https://github.com/r-lib/rig/releases/download/latest/rig-linux-arm64-latest.tar.gz |
   sudo tar xz -C /usr/local
 
-Supported Linux distributions:
+#### Supported Linux distributions:
 
-- Ubuntu LTS from
- [r-builds](https://github.com/rstudio/r-builds#r-builds), currently
- 20.04, 22.04.
-- Debian from [r-builds](https://github.com/rstudio/r-builds#r-builds),
- currently 10, 11 and 12.
+- Debian 10, 11, 12,
+- Ubuntu 18.04, 20.04, 22.04,
+- Fedora Linux 37, 38,
+- OpenSUSE 15.3, 15.4,
+- SUSE Linux Enterprise 15 SP3, SP4,
+- CentOS 7,
+- Red Hat Enterprise Linux 7, 8, 9,
+- AlmaLinux 8, 9,
+- Rocky Linux 8, 9.
 
-Other Linux distributions are coming soon.
+We use the R builds from the Posit [R-builds
+project](https://github.com/rstudio/r-builds#r-builds).
 
 ### Auto-complete
 
@@ -178,6 +192,8 @@ Use `rig list` to list the currently installed R versions, and
 
 Run `rig` to see all commands and examples.
 
+Run `rig --help` and `rig <subcommand> --help` to see the documentation.
+
 ### Command list:
 
  rig add -- install a new R version [alias: install]
@@ -217,6 +233,7 @@ Run `rig <subcommand> --help` for information about a subcommand.
 
 ### Linux `rig system` subcommands
 
+ rig system detect-platform -- detect operating system version and distribution
  rig system add-pak -- install or update pak for an R version
  rig system make-links -- create R-* quick links
  rig system setup-user-lib -- set up automatic user package libraries [alias: create-lib]
@@ -251,13 +268,13 @@ R-devel. It is available for x86_64 and arm64 systems:
  > docker run ghcr.io/r-lib/rig/r rig ls
  * name version aliases
  ------------------------------------------
-  3.5.3
   3.6.3
   4.0.5
-  4.1.3 oldrel
- * 4.2.2 release
-  devel (R 4.3.0)
-  next (R 4.2.2)
+  4.1.3
+  4.2.3 oldrel
+ * 4.3.1 release
+  devel (R 4.4.0)
+  next (R 4.3.1)
 
 ### Docker container features: