Add project files.

Common.Library/Interfaces/IRepository.cs

@@ -0,0 +1,10 @@
+namespace Common.Library;
+
+public interface IRepository<TEntity>
+{
+    Task<IEnumerable<TEntity>> Get();
+    Task<TEntity?> Get(int id);
+    Task<int> Save(TEntity entity);
+    bool Delete(TEntity entity);
+    Task<bool> DeleteById(int Id);
+}