[EventCounters] Adding example project

examples/event-counters/Examples.EventCounters/Examples.EventCounters.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="OpenTelemetry" Version="1.3.1" />
+    <PackageReference Include="OpenTelemetry.Exporter.Console" Version="1.3.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(RepoRoot)\src\OpenTelemetry.Instrumentation.EventCounters\OpenTelemetry.Instrumentation.EventCounters.csproj" />
+  </ItemGroup>
+
+</Project>

examples/event-counters/Examples.EventCounters/Examples.EventCounters/Examples.EventCounters.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

examples/event-counters/Examples.EventCounters/Program.cs

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+// <copyright file="Program.cs" company="OpenTelemetry Authors">
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// </copyright>
+
+using System.Diagnostics.Tracing;
+using OpenTelemetry;
+using OpenTelemetry.Metrics;
+
+// Create EventSources and EventCounters
+EventSource eventSource = new("MyEventSource");
+EventCounter eventCounter = new("MyEventCounter", eventSource);
+PollingCounter pollingCounter = new("MyPollingCounter", eventSource, () => new Random().NextDouble());
+
+// Create and Configure Meter Provider
+using var meterProvider = Sdk.CreateMeterProviderBuilder()
+    .AddEventCountersInstrumentation(options =>
+    {
+        options.RefreshIntervalSecs = 1;
+        options.AddEventSources(eventSource.Name);
+    })
+    .AddConsoleExporter()
+    .Build();
+
+eventCounter.WriteMetric(0);
+eventCounter.WriteMetric(1000);
+
+Thread.Sleep(1500);

examples/event-counters/Examples.EventCounters/README.md

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+# EventCounters Instrumentation for OpenTelemetry .NET - Examples
+
+This is an all-in-one sample that shows how to publish EventCounters using
+the OpenTelemetry Metrics Api.
+
+## Expected Output
+
+After running `dotnet run` from this directory
+
+```text
+Resource associated with Metric:
+    service.name: unknown_service:Examples.EventCounters
+
+Export EventCounters.MyEventSource.MyEventCounter, Meter: OpenTelemetry.Instrumentation.EventCounters/1.0.0.0
+(2022-11-01T17:37:37.9046769Z, 2022-11-01T17:37:38.4014060Z] DoubleGauge
+Value: 500
+
+Export EventCounters.MyEventSource.MyPollingCounter, Meter: OpenTelemetry.Instrumentation.EventCounters/1.0.0.0
+(2022-11-01T17:37:37.9076414Z, 2022-11-01T17:37:38.4014299Z] DoubleGauge
+Value: 0.5233669819037192
+```