(GH-43) Use Svg or Png for icons

src/chocolatey.package.validator/chocolatey.package.validator.csproj

@@ -163,6 +163,7 @@
     <Compile Include="infrastructure.app\rules\TitleNotEmptyGuideline.cs" />
     <Compile Include="infrastructure.app\rules\TitleNotSameAsPackageIdGuideline.cs" />
     <Compile Include="infrastructure.app\rules\UninstallAutomationScriptNamedCorrectlyRequirement.cs" />
+    <Compile Include="infrastructure.app\rules\UsePngOrSvgForIconSuggestion.cs" />
     <Compile Include="infrastructure.app\services\IPackageValidationService.cs" />
     <Compile Include="infrastructure.app\services\PackageValidationService.cs" />
     <Compile Include="infrastructure.app\tasks\PrepareValidationResultsTask.cs" />

src/chocolatey.package.validator/infrastructure.app/rules/UsePngOrSvgForIconSuggestion.cs

@@ -0,0 +1,36 @@
+// Copyright © 2015 - Present RealDimensions Software, LLC
+//
+// 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.
+
+namespace chocolatey.package.validator.infrastructure.app.rules
+{
+    using NuGet;
+    using infrastructure.rules;
+
+    public class UsePngOrSvgForIconSuggestion : BasePackageRule
+    {
+        public override string ValidationFailureMessage
+        {
+            get
+            {
+                return "As per the [packaging guidelines]() icons should be either a png or svg file.  Please see [here](https://github.com/chocolatey/package-validator/wiki/UsePngOrSvgForPackageIcons) for further information and guidance.";
+            }
+        }
+
+        protected override PackageValidationOutput is_valid(IPackage package)
+        {
+            return package.IconUrl.ToString().EndsWith(".png") || package.IconUrl.ToString().EndsWith(".svg");
+        }
+    }
+}