Added README

README.md

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+# grex_outline_post_process
+
+
+A plugin for the [Bevy](https://bevyengine.org) engine which adds an outline post-processing effect.
+
+## Screenshots
+![](./doc/screenshot.png)
+![](./doc/screenshot_smooth.png)
+Configuration Used:
+```rs
+grex_outline_post_process::components::OutlinePostProcessSettings {
+    weight: 2.0,
+    threshold: 0.0,
+}
+```
+
+## Installation
+
+### Using git URL in Cargo.toml
+```toml
+[dependencies.grex_outline_post_process]
+git = "https://github.com/exvacuum/grex_outline_post_process.git"
+```
+
+### Workspace Submodule
+I recommend organizing your Bevy project as a [cargo workspace](https://doc.rust-lang.org/book/ch14-03-cargo-workspaces.html) and pulling this repository as a git submodule:
+```bash
+git submodule add git@github.com:exvacuum/grex_outline_post_process.git
+```
+
+We can add a [patch override](https://doc.rust-lang.org/cargo/reference/overriding-dependencies.html#overriding-repository-url) for this repository in the workspace's `Cargo.toml`:
+```toml
+[patch."https://github.com/exvacuum/grex_outline_post_process.git".grex_outline_post_process]
+path = "./grex_outline_post_process"
+```
+
+And then, from a crate that depends on it:
+```toml
+[dependencies.grex_outline_post_process]
+git = "https://github.com/exvacuum/grex_outline_post_process.git"
+```
+
+
+## Usage
+
+In `main.rs`:
+```rs
+use bevy::prelude::*;
+use grex_outline_post_process;
+
+fn main() {
+    App::new()
+        .add_plugins((
+            DefaultPlugins,
+            grex_outline_post_process::OutlinePostProcessPlugin,
+        ))
+        .run();
+}
+```
+
+When spawning a camera:
+```rs
+commands.spawn((
+    // Camera3dBundle...
+    grex_outline_post_process::components::OutlinePostProcessSettings {
+        weight: 2.0,
+        threshold: 0.0,
+    }
+));
+```
+
+This effect will only run for cameras which contain this component.
+