Add some README content

README.md

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 # injector
 
+Barebones library to launch a process with a DLL injected. Intended use-case is to be invoked from C# P/Invoke.
+
+```
+using System;
+using System.Runtime.InteropServices;
+
+class Program
+{
+    [DllImport("injector.dll", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Unicode)]
+    public static extern uint LaunchInjected(
+        string command_line,
+        string working_directory,
+        string inject_dll_path,
+        [MarshalAs(UnmanagedType.LPStr)]
+        string initialize_function);
+
+    static void Main(string[] args)
+    {
+        uint process_id = LaunchInjected(
+            "c:\\full\\path\\to\\app.exe -arg 0 -arg 1",
+            "c:\\full\\path\\to\\",
+            "c:\\some\\utility\\inject.dll",
+            "Inject_Initialize_Function");
+
+        Console.WriteLine("Launched process id {0}", process_id);
+    }
+}
+```