Add package metadata.

ReleaseNotes.md

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+# Release Notes
+
+## 1.0.0
+
+* Initial release.
+* Port of bsdiff 4.3 to managed code.

src/BsDiff/BsDiff.csproj

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   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
     <IsPackable>true</IsPackable>
+    <Description>.NET port of bsdiff, Colin Pervical's binary diff/patch utility, in 100% managed code.</Description>
+    <PackageId>BsDiff</PackageId>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
+    <PackageTags>bsdiff;bspatch;binary;patch</PackageTags>
   </PropertyGroup>
 
   <ItemGroup>
     <PackageReference Include="SharpZipLib" Version="1.4.2" />
   </ItemGroup>
 
+  <ItemGroup>
+    <None Include="README.md" Pack="true" PackagePath="\"/>
+  </ItemGroup>
+
 </Project>

src/BsDiff/README.md

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+## About
+
+BsDiff is a 100% managed implementation of Colin Percival's [bsdiff algorithm](https://www.daemonology.net/bsdiff/).
+It provides functions to create a patch between two binary files and to apply that patch (to the first file, producing the second file).
+The patch is usually much smaller than the size of the second file, so this can be used to optimize download size.
+
+## Usage
+
+Given two existing files, you can create a patch as follows:
+
+```csharp
+var oldFileBytes = File.ReadAllBytes("oldFile");
+var newFileBytes = File.ReadAllBytes("newFile");
+using var outputStream = File.Create("patchFile");
+BinaryPatch.Create(oldFileBytes, newFileBytes, outputStream);
+```
+
+You can then apply the patch to the old file to produce the new file:
+
+```csharp
+using var oldFile = File.OpenRead("oldFile");
+using var newFile = File.Create("newFile");
+BinaryPatch.Apply(oldFile, () => File.OpenRead("patchFile"), newFile);
+```