Add readme and license.

readme.md

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+The fantastic game *The Talos Principle* has these two dimensional Tetris like
+puzzles that I find annoying to solve. This program can solve them for me.
+
+
+First, specify the field size and puzzle pieces:
+
+```rust
+fn main() {
+    let field = Field::new(5, 5);
+    let pieces = vec![
+        // Piece::cleveland_z(), // -_
+        // Piece::rhode_island_z(), // _-
+        // Piece::teewee(),
+        // Piece::hero(),
+        // Piece::orange_ricky(), // ___|
+        // Piece::blue_ricky(), // |___
+        // Piece::smashboy(),
+    ];
+    let result = solve(field, pieces);
+    match result {
+        Some(field) => println!("{}", field),
+        None => println!("No solution",)
+    };
+}
+```
+
+Then, get the solution with `cargo run --release`.