Merge branch 'add-dnf-plugin'

Close #2452

plugins/dnf/README.md

+## Description
+
+This plugin makes `dnf` usage easier by adding aliases for the most
+common commands.
+
+`dnf` is the new package manager for RPM-based distributions, which
+replaces `yum`.
+
+## Aliases
+
+| Alias | Command                 | Description              |
+|-------|-------------------------|--------------------------|
+| dnfl  | `dnf list`              | List packages            |
+| dnfli | `dnf list installed`    | List installed packages  |
+| dnfgl | `dnf grouplist`         | List package groups      |
+| dnfmc | `dnf makecache`         | Generate metadata cache  |
+| dnfp  | `dnf info`              | Show package information |
+| dnfs  | `dnf search`            | Search package           |
+| **Use `sudo`**                                             |
+| dnfu  | `sudo dnf upgrade`      | Upgrade package          |
+| dnfi  | `sudo dnf install`      | Install package          |
+| dnfgi | `sudo dnf groupinstall` | Install package group    |
+| dnfr  | `sudo dnf remove`       | Remove package           |
+| dnfgr | `sudo dnf groupremove`  | Remove package group     |
+| dnfc  | `sudo dnf clean all`    | Clean cache              |

plugins/dnf/dnf.plugin.zsh

+## Aliases
+
+alias dnfl="dnf list"                       # List packages
+alias dnfli="dnf list installed"            # List installed packages
+alias dnfgl="dnf grouplist"                 # List package groups
+alias dnfmc="dnf makecache"                 # Generate metadata cache
+alias dnfp="dnf info"                       # Show package information
+alias dnfs="dnf search"                     # Search package
+
+alias dnfu="sudo dnf upgrade"               # Upgrade package
+alias dnfi="sudo dnf install"               # Install package
+alias dnfgi="sudo dnf groupinstall"         # Install package group
+alias dnfr="sudo dnf remove"                # Remove package
+alias dnfgr="sudo dnf groupremove"          # Remove package group
+alias dnfc="sudo dnf clean all"             # Clean cache