Update README (#1089)

* Update README.

* Update README version 2.

doc/package_maintainers.md

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+# Packaging
+[![Packaging status](https://repology.org/badge/vertical-allrepos/ncspot.svg)](https://repology.org/project/ncspot/versions)
+
+## Compilation Instructions
+ncspot makes use of the standard Cargo build system for everything. To compile a release version,
+execute `cargo build --release` in the terminal from the project root. The executable file can be
+found at `target/release/ncspot`. For detailed build instructions, have a look at [the developer
+documentation](/doc/developers.md).
+
+Additional features can be included by appending them to the build command. A list of all the
+available features can be found in the [Cargo.toml](/Cargo.toml) under the `[features]` table. To
+activate a feature, include its name like `cargo build --release --features feature1,feature2,...`.
+To disable the default features, add `--no-default-features` to the command.
+
+## Other Provided Files
+The following is a list of other files that are provided by ncspot. Some of them need to be
+generated. Execute `cargo xtask --help` for more information.
+- LICENSE
+- images/logo.svg (optional)
+- misc/ncspot.desktop (for Linux systems)
+- misc/ncspot.1 (for Linux systems)
+- misc/ncspot.bash (bash completions)
+- misc/\_ncspot (zsh completions)
+- misc/ncspot.fish (fish completions)
+- misc/ncspot.elv (elvish completions)
+- misc/\_ncspot.ps1 (powershell completions)
+
+## Building a Debian Package
+The [`cargo-deb`](https://github.com/kornelski/cargo-deb#readme) package can be used to build a
+Debian package with the following commands. The package will be generated in `target/debian/`.
+
+```sh
+cargo install cargo-deb
+cargo deb
+```
+