doc: inform how to bootstrap a new system

BOOTSTRAP.md

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+# Bootstrap
+
+Qusal bootstrap strategy.
+
+## Table of Contents
+
+* [Description](#description)
+* [Essential](#essential)
+* [Optional](#optional)
+  * [Internet communication](#internet-communication)
+  * [Files](#files)
+  * [Admin](#admin)
+
+## Description
+
+With so many packages, you are wondering, how to bootstrap a new system? Which
+order should the packages be applied? Well, the answer depends on your goal.
+
+Bellow you will find a list sorted by task, which have projects that can help
+you accomplish your mission.
+
+## Essential
+
+- Base (in order):
+  - [dom0](salt/dom0/README.md)
+  - [debian-minimal](salt/debian-minimal/README.md)
+  - [fedora-minimal](salt/fedora-minimal/README.md)
+  - [sys-cacher](salt/sys-cacher/README.md)
+  - [mgmt](salt/mgmt/README.md)
+
+- Networking:
+  - [sys-net](salt/sys-net/README.md)
+  - [sys-firewall](salt/sys-firewall/README.md)
+
+- Miscellaneous:
+  - [vault](salt/vault/README.md)
+  - [sys-gui](salt/sys-gui/README.md)
+  - [sys-audio](salt/sys-audio/README.md)
+
+## Optional
+
+### Internet communication
+
+- Firewall, DNS Sinkhole and VPN Tunnel:
+  - [sys-mirage-firewall](salt/sys-mirage-firewall/README.md)
+  - [sys-pihole](salt/sys-pihole/README.md)
+  - [sys-wireguard](salt/sys-wireguard/README.md)
+
+- Web browser and file retriever:
+  - [browser](salt/browser/README.md)
+  - [fetcher](salt/fetcher/README.md)
+
+- Instant messaging and E-Mail:
+  - [mutt](salt/mutt/README.md)
+  - [signal](salt/signal/README.md)
+
+### Files
+
+- USB:
+  - [usb](salt/usb/README.md)
+  - [sys-usb](salt/sys-usb/README.md)
+
+- Multimedia:
+  - [reader](salt/reader/README.md)
+  - [media](salt/media/README.md)
+
+- File sharing:
+  - [sys-ssh](salt/sys-ssh/README.md)
+  - [sys-syncthing](salt/sys-syncthing/README.md)
+  - [sys-rsync](salt/sys-rsync/README.md)
+
+### Admin
+
+- Remote administration:
+  - [remmina](salt/remmina/README.md)
+  - [ssh](salt/ssh/README.md)
+  - [sys-ssh-agent](salt/sys-ssh-agent/README.md)
+
+- Remote task execution and configuration management:
+  - [ansible](salt/ansible/README.md)
+  - [docker](salt/docker/README.md)
+  - [terraform](salt/terraform/README.md)
+
+- Coding:
+  - [dev](salt/dev/README.md)
+  - [sys-pgp](salt/sys-pgp/README.md)
+  - [sys-git](salt/sys-git/README.md)
+  - [sys-ssh-agent](salt/sys-ssh-agent/README.md)