Add `rw` command

Users should be reminded to issue `rw` in case the first thing they want to do is change password.
It is mentioned in the login screen, and explicit for step 5 , but not mentioned here. 
The error message gives if the root filesystem is read-only is  "passwd: Authentication token lock busy" is particularly obscure.
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Anthon van der Neut 2020-08-28 17:03:11 +02:00 committed by GitHub
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@ -45,7 +45,8 @@ Decompress and flash image and follow to the [final steps](#the-final-steps). Be
3. Congratulations! Your Pi-KVM will be available via SSH (`ssh root@<addr>` with password `root` by default) and HTTPS (try to open in a browser the URL `https://<addr>`, the login `admin` and password `admin` by default). For HTTPS a self-signed certificate is used by default.
4. To change the root password use command `passwd` via SSH or webterm. To change Pi-KVM web password use `kvmd-htpasswd set admin`.
4. To change the root password use command `passwd` via SSH or webterm. To change Pi-KVM web password use `kvmd-htpasswd set admin`.
As indicated on the login screen use `rw` to make the root filesystem writable, before issuing these commands.
5. After installation, we recommend you to update your operating system:
```shell