README.md: List out dependencies and installation instructions

Based on work done by Natanael.

https://github.com/containers/toolbox/pull/492

README.md

@@ -41,6 +41,35 @@ This will create a container called `fedora-toolbox-<version-id>`.
 ⬢[user@toolbox ~]$
 ```
 
+## Dependencies and Installation
+
+Toolbox requires at least Podman 1.4.0 to work, and uses the Meson build
+system.
+
+The following dependencies are required to build it:
+- meson
+- go-md2man
+- systemd
+
+The following dependencies enable various optional features:
+- bash-completion
+
+It can be built and installed as any other typical Meson-based project:
+```
+[user@hostname toolbox]$ meson -Dprofile_dir=/etc/profile.d builddir
+[user@hostname toolbox]$ ninja -C builddir
+[user@hostname toolbox]$ sudo ninja -C install
+```
+
+Toolbox is written in Go. Consult the
+[src/go.mod](https://github.com/containers/toolbox/blob/master/src/go.mod) file
+for a full list of all the Go dependencies.
+
+By default, Toolbox uses Go modules and all the required Go packages are
+automatically downloaded as part of the build. There's no need to worry about
+the Go dependencies, unless the build environment doesn't have network access
+or any such peculiarities.
+
 ## Goals and Use Cases
 
 ### High Level Goals