Add more guidelines

CONTRIB.txt

@@ -6,5 +6,20 @@ Please send pull requests to add what you've come up with.
 
 ## Guidelines
 
+### Project structure
+
+ * One class library and NuGet package per P/Invoke'd DLL.
+ * Types and enums in common Windows header files should be defined in the PInvoke.Windows.Core project.
+
+### File structure
+
  * Nested classes and structs go into their own files.
  * P/Invoke methods go into the *binary*.cs file. While higher level helper methods go in *binary*.Helpers.cs.
+
+ ### Naming
+
+ * All method names should match exactly their names as found in the native DLL.
+   Do not remove a common prefix even if it is redundant with the class name.
+   This is for predictability across the entire family of libraries and so
+   searches for method names as they are found in the native libraries' documentation
+   will always turn up results if they are defined by these packages.

README.md

@@ -6,6 +6,20 @@ P/Invoke
 A library intended to contain all P/Invoke method signatures for popular operating systems.
 Think of it as http://pinvoke.net, but proven to compile, work properly
 
+## Usage
+
+Install the NuGet package(s) for the DLLs you want to P/Invoke into.
+For example, if you want to P/Invoke into Win32's BCrypt.dll, install this package:
+
+    Install-Package PInvoke.BCrypt
+
+Then import the following namespaces, as demonstrated below (if using C# 6):
+
+    using PInvoke;
+    using static PInvoke.BCrypt; // Supported in C# 6 (VS2015) and later.
+
+This will allow you to conveniently call these methods either 
+
 ## Design goals
 
 Provide a slightly higher than lowest level API for P/Invoke signatures.
@@ -16,9 +30,6 @@ or elsewhere as applicable.
 
 This is a portable library so you can use it anywhere.
 
-## Testing
-In as many cases as possible, these P/Invoke method signatures will be tested via unit testing in this project.
-
 ## Distribution
 This library should be available on NuGet for easy consumption by your projects.
 You may also copy and paste the P/Invoke signatures you need directly into your projects if desired.