Add a quick start section to the README

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

README.md

@@ -20,6 +20,26 @@ Frequenz Channels are mostly designed after [Go
 channels](https://tour.golang.org/concurrency/2) but it also borrows ideas from
 [Rust channels](https://doc.rust-lang.org/book/ch16-02-message-passing.html).
 
+## Quick Start
+
+We assume you are on a system with Python available. If that is not the case,
+please [download and install Python](https://www.python.org/downloads/) first.
+
+To install Frequenz Channels, you probably want to create a new virtual
+environment first. For example, if you use a `sh` compatible shell, you can do
+this:
+
+```sh
+python3 -m venv .venv
+. .venv/bin/activate
+```
+
+Then, just install using `pip`:
+
+```sh
+python3 -m pip install frequenz-channels
+```
+
 ## Contributing
 
 If you want to know how to build this project and contribute to it, please

docs/index.md

@@ -62,7 +62,8 @@ python3 -m venv .venv
 
     This will create the virtual environment and activate it automatically for you.
 
-Now you can install Frequenz Channels by using `pip`:
+Now you can install Frequenz Channels by using `pip` (if you don't have `pip` installed
+you can follow [the official instructions](https://pip.pypa.io/en/stable/installation/)):
 
 ```sh
 python3 -m pip install frequenz-channels