chore: switch license to MIT and add rand/serde dependencies

- License the crate as MIT only.
- Fill in package description and `readme` field.
- Add rand 0.9 and rand_distr 0.5 (the `StdRng` and Normal sampler the
  spec mandates as the single Rng type).
- Add optional serde 1 gated behind a `serde` feature flag for later
  derives on core data types.

Cargo.toml

@@ -2,5 +2,15 @@
 name = "heuropt"
 version = "0.1.0"
 edition = "2024"
+description = "A practical Rust toolkit for heuristic single-, multi-, and many-objective optimization."
+license = "MIT"
+readme = "README.md"
+
+[features]
+default = []
+serde = ["dep:serde"]
 
 [dependencies]
+rand = "0.9"
+rand_distr = "0.5"
+serde = { version = "1", features = ["derive"], optional = true }

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Stephen Waits
+
+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.