Update README.md (#406)

Added references to the enabled and disabled pipelining samples and updated info for the async and sync samples.

Author: alexkeh

samples/README.md

@@ -16,7 +16,7 @@ Running ODP.NET Core Samples from Command Line
 1) Install .NET Core SDK from Microsoft's website: https://dotnet.microsoft.com/download
 2) Open a terminal such as PowerShell, command prompt, or bash. Enter the following commands to create and setup your ODP.NET Core sample: <br>
  A) dotnet new console --output (Sample Name) <br>
- B) dotnet add package Oracle.ManagedDataAccess.Core --version (e.g. 3.21.120)
+ B) dotnet add package Oracle.ManagedDataAccess.Core --version (e.g. 23.5.0)
 4) Replace the contents of Program.cs with the GitHub sample code of interest.
 5) Insert your user id, password, and data source. The sample will have its own README or comments to indicate additional configuration that may be required.
 6) Run using the following command: dotnet run --project (Sample Name)
@@ -44,8 +44,8 @@ PL/SQL Associative Array
 
 Async
 -----
-* Async Sample: Demonstrates using asynchronous ODP.NET (managed or core) and times its execution time.<br>
-* Sync Sample: Demonstrates using synchronous ODP.NET (managed or core) and times its execution time.
+* Async Sample: Demonstrates using asynchronous ODP.NET (managed or core) and measures operation time.<br>
+* Sync Sample: Demonstrates using synchronous ODP.NET (managed or core) and measures operation time to compare with async.
 
 Autonomous Database
 -------------------
@@ -143,6 +143,11 @@ Performance Counters
 --------------------
 * Sample 1: Demonstrates how to programmatically use ODP.NET performance counters.
 
+Pipelining and Async
+--------------------
+* Pipelining and Async Sample: Demonstrates using pipelining and async ODP.NET (managed or core) and measures operation time.<br>
+* No Pipelining and Sync Sample: Disables pipelining while using synchronous ODP.NET (managed or core) and measures operation time to compare with async and pipelining sample.
+
 Ref Cursor
 ----------
 * Sample 1: Demonstrates how a REF Cursor is obtained as an OracleDataReader. <br>