Added README

README.md

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+<h1 align="center">Set-P</h1>
+<p align="center">Add a path to PATH, straight from your terminal</h3>
+
+Set-P is powered by [CLI11](https://github.com/CLIUtils/CLI11)
+
+## What is Set-P?
+Set-P is a command line tool made for windows that allows you to add paths to the global PATH environment variable straight from your command line.
+
+Note: You still will need to refresh the environment in each shell manually, if you have Chocolatey installed, you may use refreshenv
+
+## Usage
+Syntax: setp `[OPTIONS] [path]`
+
+Where `path` is the path you want to add to the global PATH environment variable. (If path contains spaces, it must be surrounded by quotation marks)
+
+### Flags
+`-f` - Adds the path to the beginning of the PATH environment variable instead of at the end. Useful for overriding other paths
+`-u` - Adds path to the current user instead of the Local PC. Does not require Administrator. If this flag is not specified, then Administrator is required.
+`-r` - [NYI] Removes the path from the PATH environment variable
+
+## Installation
+Download the latest Set-P binary for your architecture (32-bit or x64) at [releases](https://github.com/m-doescode/set-p/releases)
+
+## Building from source
+
+### Prerequisites
+1. You must have MYS2 MinGW-w64 installed. You may install it from [msys2.org/#installation](https://www.msys2.org/#installation)
+2. You must add `C:\msys64\usr\bin` to path, or wherever your MSYS2 installation is located. (I know, ironic, right?)
+3. You must have the following packages installed: (You can install a package by using pacman -S <package_name>:
+	- make
+	- clang
+### Building
+1. Open the downloaded source
+2. Run `make` (You may add `-r` or `-j16` to increase speed)
+3. Once it is finished, go to the build directory
+4. Run `setp.exe` or add the folder to path
+
+### Found any bugs?
+Report them to me! Open a new [issue](https://github.com/m-doescode/set-p/issues) or create a new thread at [discussions](https://github.com/m-doescode/set-p/discussions)