Added DS18B20 sample

Author: devdotnetorg

dotnet-iot-ds18b20/Program.cs

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+using System;
+using System.Linq;
+using Iot.Device.OneWire;
+
+namespace dotnet_iot_ds18b20
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("DS18B20!");
+            try
+            {
+                var devOneWire = OneWireThermometerDevice.EnumerateDevices().FirstOrDefault();
+                double temp=devOneWire.ReadTemperatureAsync().Result.DegreesCelsius;
+                Console.WriteLine($"Temperature = {Math.Round(temp, 2, MidpointRounding.AwayFromZero)}");
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"No 1-Wire sensors found. Exception: {ex.Message}");                
+            }            
+        }
+    }
+}

dotnet-iot-ds18b20/dotnet-iot-ds18b20.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+    <RootNamespace>dotnet_iot_ds18b20</RootNamespace>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Iot.Device.Bindings" Version="1.5.0" />
+    <PackageReference Include="System.Device.Gpio" Version="1.5.0" />
+  </ItemGroup>
+
+</Project>

dotnet-iot-ds18b20/dotnet-iot-ds18b20.sln

@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31702.278
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "dotnet-iot-ds18b20", "dotnet-iot-ds18b20.csproj", "{E1F261D1-67DB-4D67-9DC9-4EA8F3C1C7AE}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{E1F261D1-67DB-4D67-9DC9-4EA8F3C1C7AE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E1F261D1-67DB-4D67-9DC9-4EA8F3C1C7AE}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E1F261D1-67DB-4D67-9DC9-4EA8F3C1C7AE}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E1F261D1-67DB-4D67-9DC9-4EA8F3C1C7AE}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {59E05D99-1523-4246-8D44-0A554CA08EEA}
+	EndGlobalSection
+EndGlobal