chore: Add license and necessary Crates.io metadata

Author: nhubbard

Cargo.toml

@@ -2,6 +2,10 @@
 name = "ironbeam"
 version = "1.0.0"
 edition = "2024"
+license = "MIT"
+description = "A batch processing clone of Apache Beam in Rust."
+license-file = "LICENSE"
+repository = "https://github.com/nhubbard/ironbeam"
 
 [features]
 default = ["io-jsonl", "io-csv", "io-parquet", "parallel-io", "compression-gzip", "compression-zstd", "compression-bzip2", "compression-xz", "metrics", "checkpointing"]

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 Nicholas Hubbard
+
+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.