Add dedicated package README

NuGet.org's content security policy and reduced Markdown rendering support mean that the project README doesn't render well in the NuGet gallery. Instead, add a dedicated package README with pared-back information that will render better.

Directory.Build.props

@@ -32,7 +32,7 @@
     <PackageIcon>package-icon.png</PackageIcon>
     <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
     <PackageProjectUrl>https://github.com/justeattakeaway/JustSaying</PackageProjectUrl>
-    <PackageReadmeFile>README.md</PackageReadmeFile>
+    <PackageReadmeFile>package-readme.md</PackageReadmeFile>
     <PackageReleaseNotes>$(PackageProjectUrl)/releases</PackageReleaseNotes>
     <PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
     <PackageTags>aws,sns,sqs</PackageTags>

package-readme.md

@@ -0,0 +1,19 @@
+# JustSaying
+
+[![NuGet](https://img.shields.io/nuget/v/JustSaying.svg?maxAge=3600)](https://www.nuget.org/packages/JustSaying/)
+[![Build status](https://img.shields.io/github/actions/workflow/status/justeattakeaway/JustSaying/build.yml?branch=main&logo=github)](https://github.com/justeattakeaway/JustSaying/actions?query=workflow%3Abuild+branch%3Amain)
+[![codecov](https://codecov.io/gh/justeattakeaway/JustSaying/branch/main/graph/badge.svg)](https://codecov.io/gh/justeattakeaway/JustSaying)
+
+A helpful library for publishing and consuming events/messages over SNS (SNS/SQS as a message bus).
+
+## Documentation
+
+Documentation can be found [here](https://justeat.gitbook.io/justsaying/).
+
+## Feedback
+
+Any feedback or issues for this library can be added to the issues in [GitHub](https://github.com/justeattakeaway/JustSaying/issues "This package's issues on GitHub.com").
+
+## License
+
+This package is licensed under the [Apache 2.0](https://www.apache.org/licenses/LICENSE-2.0.html "The Apache 2.0 license") license.