Add init & telemetry info

README.md

@@ -6,7 +6,7 @@ based on [wsldl](https://github.com/yuk7/wsldl).
 [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](http://makeapullrequest.com)
 ![License](https://img.shields.io/github/license/Vinfall/ClearWSL.svg?style=flat-square)
 
-**Notice: This is Clear Linux OS backed by Intel. Not to be confused with Clear OS, which is a completely different CentOS/RHEL-based distro.**
+**Notice: This is *Clear Linux OS* backed by Intel. Not to be confused with *Clear OS*, which is a completely different CentOS/RHEL-based distro.**
 
 ## Requirements
 * Windows 10 Fall Creators Update x64 or later.
@@ -21,8 +21,43 @@ based on [wsldl](https://github.com/yuk7/wsldl).
 Exe filename is using to the instance name to register.
 If you rename it, you can register with a different name and have multiple installs.
 
-## How-to-Use(for Installed Instance)
-#### exe Usage
+## Init
+
+For now there would be a warning `WSL (XX) ERROR: CreateProcessEntryCommon:XXX: getpwuid(0) failed 2` during startup, but it's harmless despite annoying.
+I will accept and appreciate it if anyone opens a PR regarding this!
+
+By default, ClearWSL comes with no `sudo` package.
+To install `sudo` and make it function properly:
+```sh
+# Create /etc/passwd as it's not available by default
+passwd
+# Install `sudo`
+swupd bundle-add --assume=yes sudo
+# Check update
+sudo swupd check-update
+# Update
+sudo swupd update
+```
+
+## Telemetrics
+
+It's worth mentioning that Clear Linux OS has a [built-in telemetry function](https://clearlinux.github.io/clear-linux-documentation/guides/clear/telemetrics.html) and **opt-in** by default. In ClearWSL the client is *not* active (maybe due to the fact that SystemD needs to be explicitly enabled in `/etc/wsl.conf`).
+
+If you use SystemD, it's better to ensure the telemetrics are disabled if you don't want this feature:
+```sh
+# Disabling after install
+sudo telemctl stop
+# Opt out of telemetry
+sudo telemctl opt-out
+```
+
+If you get `sudo: telemctl: command not found`, it means that you don't have `telemetrics` bundle installed, so no worries about telemetry.
+
+For further information, please read [the official documentation for Clear Linux* Project](https://clearlinux.github.io/clear-linux-documentation/guides/clear/telemetrics.html#id9).
+
+## How-to-Use (for Installed Instance)
+
+### exe Usage
 ```dos
 Usage :
     <no args>
@@ -48,8 +83,7 @@ Usage :
       - Print this usage message.
 ```
 
-
-#### How to uninstall instance
+### How to uninstall instance
 ```dos
 >Clear.exe clean
 ```