3 files changed, 15 insertions, 0 deletions
diff --git a/src/Notepad/Infrastructure/Core/ICommand.cs b/src/Notepad/Infrastructure/Core/ICommand.cs
new file mode 100644
index 0000000..1fadec3
--- /dev/null
+++ b/src/Notepad/Infrastructure/Core/ICommand.cs
@@ -0,0 +1,5 @@
+namespace Notepad.Infrastructure.Core {
+    public interface ICommand {
+        void Execute();
+    }
+}
+\ No newline at end of file
diff --git a/src/Notepad/Infrastructure/Core/IMapper.cs b/src/Notepad/Infrastructure/Core/IMapper.cs
new file mode 100644
index 0000000..39bad69
--- /dev/null
+++ b/src/Notepad/Infrastructure/Core/IMapper.cs
@@ -0,0 +1,5 @@
+namespace Notepad.Infrastructure.Core {
+    public interface IMapper<Input, Output> {
+        Output MapFrom(Input item);
+    }
+}
+\ No newline at end of file
diff --git a/src/Notepad/Infrastructure/Core/ISpecification.cs b/src/Notepad/Infrastructure/Core/ISpecification.cs
new file mode 100644
index 0000000..c61d8b9
--- /dev/null
+++ b/src/Notepad/Infrastructure/Core/ISpecification.cs
@@ -0,0 +1,5 @@
+namespace Notepad.Infrastructure.Core {
+    public interface ISpecification<T> {
+        bool IsSatisfiedBy(T item);
+    }
+}
+\ No newline at end of file