chore: prepare for crates.io publish v0.1.0

Add MIT LICENSE file, add repository field to macros crate, and pin
macros dependency version for registry compatibility.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: GiggleLiu

Cargo.toml

@@ -26,7 +26,7 @@ good_lp = { version = "1.8", default-features = false, features = ["highs"], opt
 inventory = "0.3"
 ordered-float = "5.0"
 rand = "0.8"
-problemreductions-macros = { path = "problemreductions-macros" }
+problemreductions-macros = { version = "0.1.0", path = "problemreductions-macros" }
 
 [dev-dependencies]
 proptest = "1.0"

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 Jin-Guo Liu and other contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

problemreductions-macros/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.1.0"
 edition = "2021"
 description = "Procedural macros for problemreductions"
 license = "MIT"
+repository = "https://github.com/CodingThrust/problem-reductions"
 
 [lib]
 proc-macro = true