diff --git a/rinseoffcli/RinseOffCLI.cs b/rinseoffcli/RinseOffCLI.cs
new file mode 100644
index 0000000..b1841e1
--- /dev/null
+++ b/rinseoffcli/RinseOffCLI.cs
@@ -0,0 +1,46 @@
+using System;
+using System.IO;
+namespace rinseoffcli
+{
+    class Program
+    {
+
+        static void showHelp(int exitCode = 1){
+            Console.WriteLine("Must specify store or load, then a file name followed by a key file.\nFormat: <verb> <data file> <key file>");
+            System.Environment.Exit(exitCode);
+        }
+        static void storeData(string filepath, string keypath){
+            Stream inputStream = Console.OpenStandardInput();
+            if (! File.Exists(keypath)){
+                Console.WriteLine("Key file " + keypath + " does not exist");
+                System.Environment.Exit(3);
+            }
+
+        }
+        static void Main(string[] args)
+        {
+            if (args.Length == 0){
+                showHelp();
+            }
+            var cmd = args[0].ToLower();
+            switch(cmd){
+                case "store":
+                    if (args.Length != 3){
+                        Console.WriteLine("Invalid number of arguments");
+                        showHelp(2);
+                    }
+                    storeData(args[1], args[2]);
+                break;
+                default:
+                    Console.WriteLine("Invalid command");
+                    showHelp();
+                break;
+                case "help":
+                case "--help":
+                case "-h":
+                showHelp();
+                break;
+            }
+        }
+    }
+}
diff --git a/rinseoffcli/rinseoffcli.csproj b/rinseoffcli/rinseoffcli.csproj
new file mode 100644
index 0000000..c73e0d1
--- /dev/null
+++ b/rinseoffcli/rinseoffcli.csproj
@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>