add readme and gitignore

.gitignore

@@ -1 +1,115 @@
-/target
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+# Edit at https://www.toptal.com/developers/gitignore?templates=visualstudiocode,rust,macos,windows,linux
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+# End of https://www.toptal.com/developers/gitignore/api/visualstudiocode,rust,macos,windows,linux
+
+.vscode/

README.md

@@ -1,2 +1,82 @@
-# expand-array-rust-macro
-A Rust proc_macro that can expand fixed size array from a smaller length input.
+# Expand Array Rust Macro
+
+This project is a simple macro that allows you to expand an array into a list of
+arguments. This is useful when you need to make available global constants in a
+dynamic library, for example.
+
+## Limitations
+
+The library can only convert string-like types for now. This is what I needed
+for my project, but I'm more than happy to accept pull requests that add more
+types.
+
+Available types:
+
+- `u8`, from:
+  - `[u8]`
+  - `[i8]`
+  - `[byte char]`
+  - `byte string`
+  - `&str`
+  - `c_char`
+  - `c string`
+- `char`, from:
+  - `[char]`
+  - `&str`
+- `c_char`, from:
+  - `[u8]`
+  - `[i8]`
+  - `[byte char]`
+  - `byte string`
+  - `&str`
+  - `c_char`
+  - `c string`
+
+## Usage
+
+```rust
+use expand_array::arrr;
+
+let var: [<target_type>; target_len] = arrr!([<target_type>; target_len], <array>);
+```
+
+## Example
+
+```rust
+use expand_array::arrr;
+
+let arr: [u8; 10] = arrr!([u8; 10], [1, 2, 3, 4, 5]);
+assert_eq!(arr, [1, 2, 3, 4, 5, 0, 0, 0, 0, 0]);
+
+let arr: [u8; 10] = arrr!([u8; 10], b"Hello");
+assert_eq!(arr, [72, 101, 108, 108, 111, 0, 0, 0, 0, 0]);
+
+let arr: [u8; 10] = arrr!([u8; 10], "Hello");
+assert_eq!(arr, [72, 101, 108, 108, 111, 0, 0, 0, 0, 0]);
+
+let arr: [char; 10] = arrr!([char; 10], ['H', 'e', 'l', 'l', 'o']);
+assert_eq!(arr, ['H', 'e', 'l', 'l', 'o', '\0', '\0', '\0', '\0', '\0']);
+
+let arr: [char; 10] = arrr!([char; 10], "Hello");
+assert_eq!(arr, ['H', 'e', 'l', 'l', 'o', '\0', '\0', '\0', '\0', '\0']);
+
+use ::std::ffi::c_char;
+
+let arr: [c_char; 10] = arrr!([c_char; 10], [72i8, 101i8, 108i8, 108i8, 111i8]);
+assert_eq!(arr, [72i8, 101i8, 108i8, 108i8, 111i8, 0i8, 0i8, 0i8, 0i8, 0i8]);
+
+let arr: [c_char; 10] = arrr!([c_char; 10], c"Hello");
+assert_eq!(arr, [72i8, 101i8, 108i8, 108i8, 111i8, 0i8, 0i8, 0i8, 0i8, 0i8]);
+
+let arr: [c_char; 10] = arrr!([c_char; 10], [72u8, 101u8, 108u8, 108u8, 111u8]);
+assert_eq!(arr, [72i8, 101i8, 108i8, 108i8, 111i8, 0i8, 0i8, 0i8, 0i8, 0i8]);
+
+let arr: [c_char; 10] = arrr!([c_char; 10], [b'H', b'e', b'l', b'l', b'o']);
+assert_eq!(arr, [72i8, 101i8, 108i8, 108i8, 111i8, 0i8, 0i8, 0i8, 0i8, 0i8]);
+
+let arr: [c_char; 10] = arrr!([c_char; 10], b"Hello");
+assert_eq!(arr, [72i8, 101i8, 108i8, 108i8, 111i8, 0i8, 0i8, 0i8, 0i8, 0i8]);
+
+let arr: [c_char; 10] = arrr!([c_char; 10], "Hello");
+assert_eq!(arr, [72i8, 101i8, 108i8, 108i8, 111i8, 0i8, 0i8, 0i8, 0i8, 0i8]);
+```