docs(en): write introduction and getting-started pages

docs/en-US/getting-started/installation.md

@@ -1 +1,83 @@
 # Installation
+
+termscp is available for many platforms. Pick the method that matches your
+system below.
+
+## Linux, FreeBSD, and macOS
+
+This shell script installs termscp on your system with a single command:
+
+```sh
+curl --proto '=https' --tlsv1.2 -sSLf https://termscp.rs/install.sh | sh
+```
+
+On macOS the installation requires [Homebrew](https://brew.sh/); otherwise the
+Rust compiler is installed to build termscp from source.
+
+## Windows
+
+Install termscp from PowerShell with a single command:
+
+```ps
+irm https://termscp.rs/install.ps1 | iex
+```
+
+Alternatively, install it with [Chocolatey](https://chocolatey.org/):
+
+```ps
+choco install termscp
+```
+
+## NetBSD
+
+Install termscp from the official repositories:
+
+```sh
+pkgin install termscp
+```
+
+## Arch Linux
+
+Install termscp from the official repositories:
+
+```sh
+pacman -S termscp
+```
+
+## Requirements
+
+The following system dependencies are required to run termscp.
+
+- Linux users:
+  - libdbus-1
+  - pkg-config
+  - libsmbclient
+- FreeBSD and NetBSD users:
+  - dbus
+  - pkgconf
+  - libsmbclient
+
+### Optional requirements
+
+These dependencies are not required to run termscp, but they are needed to
+enjoy all of its features.
+
+- Linux and FreeBSD users, to open files via `V` (at least one of these):
+  - xdg-open
+  - gio
+  - gnome-open
+  - kde-open
+- Linux users: a keyring manager. Read more in the
+  [Password security](../configuration/password-security.md) page.
+- WSL users, to open files via `V`:
+  - [wslu](https://github.com/wslutilities/wslu)
+
+## Updating termscp
+
+To update termscp to the latest version, run it from the command line with:
+
+```sh
+(sudo) termscp --update
+```
+
+For all platforms and methods, see <https://termscp.rs/install>.