build: add licence and fix build

Author: georgeRobertson

pyproject.toml

@@ -6,9 +6,6 @@ authors = [
     { name = "NHS England", email = "england.contactus@nhs.net" }
 ]
 readme = "README.md"
-packages = [
-    { include = "dve", from = "src" },
-]
 classifiers = [
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3.10",
@@ -17,6 +14,7 @@ classifiers = [
     "Topic :: Software Development :: Libraries",
     "Typing :: Typed",
 ]
+license = "MIT"
 
 [project.urls]
 Homepage = "https://github.com/NHSDigital/data-validation-engine"
@@ -27,6 +25,9 @@ Changelog = "https://github.com/NHSDigital/data-validation-engine/blob/main/CHAN
 
 [tool.poetry]
 version = "0.7.1"
+packages = [
+    { include = "dve", from = "src" },
+]
 
 [tool.poetry.dependencies]
 python = ">=3.10,<3.12"