Started placeholders for analyzers

src/Discord.Net.Analyzers/ConfigureAwaitAnalyzer.cs

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+using System;
+using System.Collections.Immutable;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+using Microsoft.CodeAnalysis.Diagnostics;
+
+namespace RegexAnalyzer
+{
+    [DiagnosticAnalyzer(LanguageNames.CSharp)]
+    public class ConfigureAwaitAnalyzer : DiagnosticAnalyzer
+    {
+        public const string DiagnosticId = "ConfigureAwait";
+        internal const string Title = "ConfigureAwait was not specified";
+        internal const string MessageFormat = "ConfigureAwait error {0}";
+        internal const string Description = "ConfigureAwait(false) should be used.";
+        internal const string Category = "Usage";
+        internal static DiagnosticDescriptor Rule =
+            new DiagnosticDescriptor(DiagnosticId, Title, MessageFormat,
+            Category, DiagnosticSeverity.Error, isEnabledByDefault: true, description: Description);
+
+        public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics => ImmutableArray.Create(Rule);
+
+        public override void Initialize(AnalysisContext context)
+        {
+            context.RegisterSyntaxNodeAction(AnalyzeNode, SyntaxKind.InvocationExpression);
+        }
+        
+        private void AnalyzeNode(SyntaxNodeAnalysisContext context)
+        {
+            /*var invocationExpr = (InvocationExpressionSyntax)context.Node;
+            var memberAccessExpr = invocationExpr.Expression as MemberAccessExpressionSyntax;
+            if (memberAccessExpr?.Name.ToString() != "Match") return;
+            var memberSymbol = context.SemanticModel.GetSymbolInfo(memberAccessExpr).Symbol as IMethodSymbol;
+            if (!memberSymbol?.ToString().StartsWith("System.Text.RegularExpressions.Regex.Match") ?? true) return;
+            var argumentList = invocationExpr.ArgumentList as ArgumentListSyntax;
+            if ((argumentList?.Arguments.Count ?? 0) < 2) return;
+            var regexLiteral = argumentList.Arguments[1].Expression as LiteralExpressionSyntax;
+            if (regexLiteral == null) return;
+            var regexOpt = context.SemanticModel.GetConstantValue(regexLiteral);
+            if (!regexOpt.HasValue) return;
+            var regex = regexOpt.Value as string;
+            if (regex == null) return;
+            try
+            {
+                System.Text.RegularExpressions.Regex.Match("", regex);
+            }
+            catch (ArgumentException e)
+            {
+                var diagnostic = Diagnostic.Create(Rule, regexLiteral.GetLocation(), e.Message);
+                context.ReportDiagnostic(diagnostic);
+            }*/
+        }
+    }
+}

src/Discord.Net.Analyzers/Discord.Net.Analyzers.csproj

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+<Project ToolsVersion="15.0" Sdk="Microsoft.NET.Sdk" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <VersionPrefix>1.0.0</VersionPrefix>
+    <VersionSuffix Condition="'$(BuildNumber)' == ''">rc-dev</VersionSuffix>
+    <VersionSuffix Condition="'$(BuildNumber)' != ''">rc-$(BuildNumber)</VersionSuffix>
+    <TargetFrameworks>netstandard1.3</TargetFrameworks>
+    <AssemblyName>Discord.Net.Analyzers</AssemblyName>
+    <Authors>RogueException</Authors>
+    <Description>A Discord.Net extension adding compile-time analysis.</Description>
+    <PackageTags>discord;discordapp</PackageTags>
+    <PackageProjectUrl>https://github.com/RogueException/Discord.Net</PackageProjectUrl>
+    <PackageLicenseUrl>http://opensource.org/licenses/MIT</PackageLicenseUrl>
+    <RepositoryType>git</RepositoryType>
+    <RepositoryUrl>git://github.com/RogueException/Discord.Net</RepositoryUrl>
+    <RootNamespace>Discord.Analyzers</RootNamespace>
+    <PackageTargetFallback>portable-net45+win81</PackageTargetFallback>
+    <DisableImplicitFrameworkReferences>true</DisableImplicitFrameworkReferences>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\Discord.Net.Core\Discord.Net.Core.csproj" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.CodeAnalysis" Version="2.0.0-rc2">
+        <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+  <PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
+    <NoWarn>$(NoWarn);CS1573;CS1591</NoWarn>
+    <WarningsAsErrors>true</WarningsAsErrors>
+    <GenerateDocumentationFile>true</GenerateDocumentationFile>
+  </PropertyGroup>
+</Project>