Bump version to 3

- Add description to each project
- Add .sh files to test and package

src/Postgres/README.md

@@ -45,7 +45,7 @@ Retrieve all customers:
 ```csharp
 // C#; parameter is table name
 // Find.All type signature is Func<string, Task<List<TDoc>>>
-var customers = await Find.All("customer");
+var customers = await Find.All<Customer>("customer");
 ```
 
 ```fsharp