diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..c32dd18
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+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 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.
+
+For more information, please refer to <https://unlicense.org/>
\ No newline at end of file
diff --git a/README.md b/README.md
index af2b1e8..a9b5a0d 100644
--- a/README.md
+++ b/README.md
@@ -9,13 +9,13 @@ To run the solutions, you will need to have Rust installed. You can install Rust
 Once you have Rust installed, you can run the solutions by running the following command:
 
 ```sh
-cargo run --bin <day>
+cargo test
 ```
 
-Where `<day>` is the day of the puzzle you want to run. For example, to run the solution for day 1, you would run the following command:
+This will run all of the tests for the solutions. You can also run the solutions for a specific day by running the following command:
 
 ```sh
-cargo run --bin day1
+cargo test day_01
 ```
 
 ### Nix
@@ -25,4 +25,8 @@ You can use the flake by running the following command:
 
 ```sh
 nix develop
+```
+
+## License
+These solutions are licensed under the Unlicense. See the [LICENSE](LICENSE) file for more information.
 ```
\ No newline at end of file
diff --git a/tests/day_01.rs b/tests/day_01.rs
new file mode 100644
index 0000000..e69de29