[c#] Add logo to NuGet packages

cs/nuget/bond.comm.csharp.nuspec

@@ -9,6 +9,7 @@
         <projectUrl>https://github.com/Microsoft/bond/</projectUrl>
         <licenseUrl>https://github.com/Microsoft/bond/blob/master/LICENSE</licenseUrl>
         <requireLicenseAcceptance>false</requireLicenseAcceptance>
+        <iconUrl>https://raw.githubusercontent.com/Microsoft/bond/master/doc/src/logos/bond-logo-64x64-transparent.png</iconUrl>
         <summary>Bond Comm is an open source, cross-platform, cross-language framework for cross-process and cross-server messaging using Bond schematized data.</summary>
         <description>
             Bond Comm is an open source, cross-platform, cross-language framework for cross-process and cross-server messaging using Bond schematized data.

cs/nuget/bond.comm.epoxy.csharp.nuspec

@@ -9,6 +9,7 @@
         <projectUrl>https://github.com/Microsoft/bond/</projectUrl>
         <licenseUrl>https://github.com/Microsoft/bond/blob/master/LICENSE</licenseUrl>
         <requireLicenseAcceptance>false</requireLicenseAcceptance>
+        <iconUrl>https://raw.githubusercontent.com/Microsoft/bond/master/doc/src/logos/bond-logo-64x64-transparent.png</iconUrl>
         <summary>Bond Epoxy is part of an open source, cross-platform, cross-language framework for cross-process and cross-server messaging using Bond schematized data.</summary>
         <description>
             Bond Comm is an open source, cross-platform, cross-language framework for cross-process and cross-server messaging using Bond schematized data.

cs/nuget/bond.comm.runtime.csharp.nuspec

@@ -9,6 +9,7 @@
         <projectUrl>https://github.com/Microsoft/bond/</projectUrl>
         <licenseUrl>https://github.com/Microsoft/bond/blob/master/LICENSE</licenseUrl>
         <requireLicenseAcceptance>false</requireLicenseAcceptance>
+        <iconUrl>https://raw.githubusercontent.com/Microsoft/bond/master/doc/src/logos/bond-logo-64x64-transparent.png</iconUrl>
         <summary>Bond Comm is an open source, cross-platform, cross-language framework for cross-process and cross-server messaging using Bond schematized data.</summary>
         <description>
             Bond Comm is an open source, cross-platform, cross-language framework for cross-process and cross-server messaging using Bond schematized data.

cs/nuget/bond.compiler.csharp.nuspec

@@ -9,6 +9,7 @@
     <projectUrl>https://github.com/Microsoft/bond/</projectUrl>
     <licenseUrl>https://github.com/Microsoft/bond/blob/master/LICENSE</licenseUrl>
     <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <iconUrl>https://raw.githubusercontent.com/Microsoft/bond/master/doc/src/logos/bond-logo-64x64-transparent.png</iconUrl>
     <summary>The Bond project's code generation C# MSBuild targets</summary>
     <description>
       Includes the Bond compiler (gbc) and C# MSBuild targets for easy integration into project builds.

cs/nuget/bond.compiler.nuspec

@@ -9,6 +9,7 @@
         <projectUrl>https://github.com/Microsoft/bond/</projectUrl>
         <licenseUrl>https://github.com/Microsoft/bond/blob/master/LICENSE</licenseUrl>
         <requireLicenseAcceptance>false</requireLicenseAcceptance>
+        <iconUrl>https://raw.githubusercontent.com/Microsoft/bond/master/doc/src/logos/bond-logo-64x64-transparent.png</iconUrl>
         <summary>The Bond project's code generator</summary>
         <description>
             Includes the GBC Compiler in charge of code generation from Bond IDL files. This is a tools-only package. For MSBuild targets to integrate automatically into your C# build, use the Bond.Compiler.CSharp package.

cs/nuget/bond.core.csharp.nuspec

@@ -9,6 +9,7 @@
         <projectUrl>https://github.com/Microsoft/bond/</projectUrl>
         <licenseUrl>https://github.com/Microsoft/bond/blob/master/LICENSE</licenseUrl>
         <requireLicenseAcceptance>false</requireLicenseAcceptance>
+        <iconUrl>https://raw.githubusercontent.com/Microsoft/bond/master/doc/src/logos/bond-logo-64x64-transparent.png</iconUrl>
         <summary>Bond is an open source, cross-platform, cross-language framework for working with schematized data.</summary>
         <description>
             Bond is an open source, cross-platform framework for working with schematized data. It supports cross-language serialization/deserialization and powerful generic mechanisms for efficiently manipulating data.

cs/nuget/bond.csharp.nuspec

@@ -9,6 +9,7 @@
         <projectUrl>https://github.com/Microsoft/bond/</projectUrl>
         <licenseUrl>https://github.com/Microsoft/bond/blob/master/LICENSE</licenseUrl>
         <requireLicenseAcceptance>false</requireLicenseAcceptance>
+        <iconUrl>https://raw.githubusercontent.com/Microsoft/bond/master/doc/src/logos/bond-logo-64x64-transparent.png</iconUrl>
         <summary>Bond is an open source, cross-platform, cross-language framework for working with schematized data.</summary>
         <description>
             Bond is an open source, cross-platform framework for working with schematized data. It supports cross-language serialization/deserialization and powerful generic mechanisms for efficiently manipulating data.

cs/nuget/bond.runtime.csharp.nuspec

@@ -9,6 +9,7 @@
         <projectUrl>https://github.com/Microsoft/bond/</projectUrl>
         <licenseUrl>https://github.com/Microsoft/bond/blob/master/LICENSE</licenseUrl>
         <requireLicenseAcceptance>false</requireLicenseAcceptance>
+        <iconUrl>https://raw.githubusercontent.com/Microsoft/bond/master/doc/src/logos/bond-logo-64x64-transparent.png</iconUrl>
         <summary>Bond is an open source, cross-platform, cross-language framework for working with schematized data.</summary>
         <description>
             Bond is an open source, cross-platform framework for working with schematized data. It supports cross-language serialization/deserialization and powerful generic mechanisms for efficiently manipulating data.