Add `MapGroup::parse()`; Start Cocoa function

Add a new `cocoa` module which will hold code to be called from
Objective-C. Currently contains a sketch of a function that will be
called via FFI from Objective-C. Haven't thought of a name for it yet.
For now contains a sample map definition "file" in a hard-coded string.
Tells `MapGroup` to parse the map definitions. Will try to create some
Cocoa objects in the `unsafe` block.

`MapGroup`:
Add `parse()` method. Given a map definition string, this new function
will parse the string into a `MapGroup` and return the result. It will
serve as the entry point to parsing DomeKey map definitions.

Thanks to these references for Combine parser error handling:
- https://github.com/ordian/toml_edit/blob/b02bc3/src/parser/document.rs
- https://github.com/ordian/toml_edit/blob/ee6895f/src/parser/errors.rs
- https://github.com/Marwes/combine/blob/54bcfed/examples/ini.rs

1 files changed, 3 insertions, 0 deletions

diff --git a/src/lib.rs b/src/lib.rs
index cf634d2..8e9a592 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,7 @@
 #[macro_use]
 extern crate combine;
 
+mod cocoa;
 mod parser;
+
+use parser::MapGroup;