Add README

Author: lockieluke

README.md

@@ -0,0 +1,39 @@
+# Swift Precompiler
+
+⚡ A fast, lightweight precompiler for Swift
+
+### Features
+
+- Add Rust's `includeStr!` like functionality to Swift with the `precompileIncludeStr` function
+
+### Installation
+
+Cargo:
+```shell
+cargo install swift-precompiler
+```
+
+### Configuration
+
+Run `swift-precompiler init` to initialise a config file `swift-precompiled.toml` with the default values
+
+Available options:
+- `dirs` - An array of directories to search for Swift source files that require precompilation
+- `path_aliases` - A dictionary of path aliases to use in `precompileIncludeStr` calls
+
+Example:
+```toml
+dirs = ["Cider/", "CiderPlaybackAgent/"]
+
+[path_aliases]
+# "@" as a path alias refers to the current working directory in most cases
+"@" = "./"
+```
+
+### Usage
+
+Including a file as a string literal at compile time:
+```swift
+let javaScript = precompileIncludeStr("path/to/file.js")
+```
+