add NuGet description

Author: neuecc

src/MemoryPack.Core/MemoryPack.Core.csproj

@@ -8,6 +8,8 @@
         <RootNamespace>MemoryPack</RootNamespace>
         <EnablePreviewFeatures>True</EnablePreviewFeatures>
         <NoWarn>$(NoWarn);CS1591;CA2255</NoWarn>
+        <PackageTags>serializer</PackageTags>
+        <Description>Core libraries(attribute, logics) of MemoryPack.</Description>
     </PropertyGroup>
 
     <ItemGroup>

src/MemoryPack.Generator/MemoryPack.Generator.csproj

@@ -13,6 +13,8 @@
         <IncludeSymbols>false</IncludeSymbols>
         <SuppressDependenciesWhenPacking>true</SuppressDependenciesWhenPacking>
         <IsRoslynComponent>true</IsRoslynComponent>
+        <PackageTags>serializer</PackageTags>
+        <Description>Code generator for MemoryPack.</Description>
     </PropertyGroup>
 
     <ItemGroup>

src/MemoryPack.Streaming/MemoryPack.Streaming.csproj

@@ -7,6 +7,8 @@
         <EnablePreviewFeatures>True</EnablePreviewFeatures>
         <NoWarn>$(NoWarn);CS1591;CA2255</NoWarn>
         <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+        <PackageTags>serializer</PackageTags>
+        <Description>Additional streaming support for MemoryPack.</Description>
     </PropertyGroup>
 
     <ItemGroup>

src/MemoryPack/MemoryPack.csproj

@@ -6,6 +6,8 @@
         <IncludeBuildOutput>false</IncludeBuildOutput>
         <IncludeContentInPack>true</IncludeContentInPack>
         <NoWarn>$(NoWarn);NU5128</NoWarn>
+        <PackageTags>serializer</PackageTags>
+        <Description>Zero encoding extreme performance binary serializer for C#.</Description>
     </PropertyGroup>
 
     <ItemGroup>