Add usage docs

docs/README.md

@@ -1,3 +1,4 @@
 # LURE Docs
 
-- [Build Scripts](build-scripts.md)
+- [Build Scripts](build-scripts.md)
+- [Usage](usage.md)

docs/usage.md

@@ -0,0 +1,140 @@
+# Usage
+
+## Table of Contents
+
+- [Commands](#commands)
+    - [install](#install)
+    - [remove](#remove)
+    - [upgrade](#upgrade)
+    - [info](#info)
+    - [list](#list)
+    - [build](#build)
+    - [addrepo](#addrepo)
+    - [removerepo](#removerepo)
+    - [refresh](#refresh)
+- [Environment Variables](#environment-variables)
+    - [LURE_DISTRO](#lure_distro)
+    - [LURE_PKG_FORMAT](#lure_pkg_format)
+    - [LURE_ARM_VARIANT](#lure_arm_variant)
+
+---
+
+## Commands
+
+### install
+
+The install command installs a command from the LURE repos. Any packages that aren't found in LURE's repos get forwarded to the system package manager for installation.
+
+Example:
+
+```shell
+lure in itd-bin
+```
+
+### remove
+
+The remove command is for convenience. All it does is forwards the remove command to the system package manager.
+
+Example:
+
+```shell
+lure rm firefox
+```
+
+### upgrade
+
+The upgrade command looks through the packages installed on your system and sees if any of them match LURE repo packages. If they do, their versions are compared using the `rpmvercmp` algorithm. If LURE repos contain a newer version, the package is upgraded.
+
+Example:
+
+```shell
+lure up
+```
+
+### info
+
+The info command displays information about a package in LURE's repos.
+
+Example:
+
+```shell
+lure info itd-bin
+```
+
+### list
+
+The list command lists all LURE repo packages as well as their versions
+
+Example:
+
+```shell
+lure ls
+```
+
+### build
+
+The build command builds a package using a `lure.sh` build script in the current directory. The path to the script can be changed with the `-s` flag.
+
+Example:
+
+```shell
+lure build
+```
+
+### addrepo
+
+The addrepo command adds a repository to LURE if it doesn't already exist. The `-n` flag sets the name of the repository, and the `-u` flag is the URL to the repository. Both are required.
+
+Example:
+
+```shell
+lure ar -n default -u https://github.com/Arsen6331/lure-repo
+```
+
+### removerepo
+
+The removerepo command removes a repository from LURE and deletes its contents if it exists. The `-n` flag specifies the name of the repo to be deleted.
+
+Example:
+
+```shell
+lure rr -n default
+```
+
+### refresh
+
+The refresh command pulls all changes from all LURE repos that have changed.
+
+Example:
+
+```shell
+lure ref
+```
+
+## Environment Variables
+
+### LURE_DISTRO
+
+The `LURE_DISTRO` environment variable should be set to the distro for which the package should be built. It tells LURE which overrides to use. Values should be the same as the `ID` field in `/etc/os-release` or `/usr/lib/os-release`. Possible values include:
+
+- `arch`
+- `alpine`
+- `opensuse`
+- `debian`
+
+### LURE_PKG_FORMAT
+
+The `LURE_PKG_FORMAT` environment variable should be set to the packaging format that should be used. Valid values are:
+
+- `archlinux`
+- `apk`
+- `rpm`
+- `deb`
+
+### LURE_ARM_VARIANT
+
+The `LURE_ARM_VARIANT` environment variable dictates which ARM variant to build for, if LURE is running on an ARM system. Possible values include:
+
+- `arm5`
+- `arm6`
+- `arm7`