Added some documentation

docs/installation.md

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+---
+title: Installation
+---
+
+## System requirements
+
+Rolens can run on the following operating systems:
+
+* Windows 10/11 amd64/arm64
+* Linux amd64/arm64
+* macOS 10.13+ amd64 (Intel)
+* macOS 11.0+ arm64 (Apple Silicon)
+
+## Pre-compiled binaries
+
+You can obtain a pre-compiled Rolens binary for macOS or installer for Windows from the [release page](https://github.com/garraflavatra/rolens/releases/latest).
+
+## From source
+
+Rolens is open-source software, which means that you can compile it from source on your own machine by cloning [the repository](https://github.com/garraflavatra/rolens) and running `make`.
+
+### Prerequisites
+
+Rolens is written in Go, so you should download the Go compiler from [the download page](https://go.dev/dl/). The minimum version required is 1.18. You can confirm whether it's installed correctly by running `go version` and checking that it outputs something similar to `go1.18.2`.
+
+In order to compile the frontend, [Node.js](https://nodejs.org/en/download) ^16.0 and the [npm](https://npmjs.com) package manager ^8.0 (included in Node.js) are required. To confirm the installed versions of those tools, execute `node -v` and `npm -v`.
+
+### Download source
+
+To obtain a copy of the source code, do either of the following:
+
+* Download a tarball or zip archive from the [release page](https://github.com/garraflavatra/rolens/releases/latest). Make sure you download the source archive, and not a pre-compiled binary.
+* Or clone [the Git repository](https://github.com/garraflavatra/rolens): `git clone git clone https://github.com/garraflavatra/rolens.git`.
+
+### Compile
+
+`cd` into the root directory of the source code and run `make`. The generated binary will live in `build/bin`. You may want to run the installer (Windows) or move the app to the Applications folder (Mac).