Add readme and license.

LICENSE

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+               GLWT(Good Luck With That) Public License
+                 Copyright (c) Everyone, except Author
+
+Everyone is permitted to copy, distribute, modify, merge, sell, publish,
+sublicense or whatever they want with this software but at their OWN RISK.
+
+                            Preamble
+
+The author has absolutely no clue what the code in this project does.
+It might just work or not, there is no third option.
+
+
+                GOOD LUCK WITH THAT PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION, AND MODIFICATION
+
+  0. You just DO WHATEVER YOU WANT TO as long as you NEVER LEAVE A
+TRACE TO TRACK THE AUTHOR of the original product to blame for or hold
+responsible.
+
+IN NO EVENT SHALL THE AUTHORS 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.
+
+Good luck and Godspeed.

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`.