Add README

Author: BrandonRomano

README.md

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+# Env
+
+Env is an [Ash](https://github.com/ash-shell/ash) module that loads a .env file in your current directory.
+
+# Getting Started
+
+Env is part of the Ash core, so you can just start using it in your Ash modules. Env also automatically runs whenever Ash starts up to load your specified environment file.
+
+# Features + Usage
+
+## CLI
+
+### Get Current Environment
+
+To figure out what env file will be loaded when Ash starts up, run the following command:
+
+```sh
+ash env:get
+```
+
+### Set Environment
+
+To set the env file that will be loaded when Ash starts up, run the following command:
+
+```sh
+ash env:set $env_file_name
+```
+
+Where `$env_file_name` is the name of the file you would like loaded.
+
+## Public Interface
+
+There's no need to import this module to use its public interface, as it is imported in Ash core.
+
+### Get Current Environment
+
+You can run the function `Env__get_filename` to get the env filename that will be loaded when Ash starts up.
+
+```sh
+filename=$(Env__get_filename)
+```
+
+### Set Current Environment
+
+To set the env file that will be loaded when Ash starts up, run the following command:
+
+```sh
+Env__set_filename
+```
+
+### Load Current Environment
+
+To load the environment file in the current directory, you can run the following command:
+
+```sh
+Env__load
+```
+
+## License
+
+[MIT](LICENSE.md)