Add README.md

Author: HerveZu

src/.idea/.idea.EntityFramework.Extensions.AddQueryFilter/.idea/indexLayout.xml

@@ -10,6 +10,7 @@
         <PackageId>EFCoreAddQueryFilter</PackageId>
         <RepositoryType>git</RepositoryType>
         <RepositoryUrl>https://github.com/HerveZu/EntityFramework.Extensions.AddQueryFilter</RepositoryUrl>
+        <PackageReadmeFile>../README.md</PackageReadmeFile>
         <Authors>Hervé Zucchinetti</Authors>
         <Description>Extensions to add query filters using EntityFramework.</Description>
     </PropertyGroup>

src/.idea/.idea.EntityFramework.Extensions.AddQueryFilter/.idea/vcs.xml

@@ -6,6 +6,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "SolutionItems", "SolutionIt
 	ProjectSection(SolutionItems) = preProject
 		..\.github\workflows\ci.yml = ..\.github\workflows\ci.yml
 		..\.github\workflows\release.yml = ..\.github\workflows\release.yml
+		README.md = README.md
 	EndProjectSection
 EndProject
 Global

src/EntityFramework.Extensions.AddQueryFilter.csproj

@@ -0,0 +1,23 @@
+# EFCoreAddQueryFilter
+EF Core only supports `.HasQueryFilter` which overwrites the previous filter per entity.
+Furthermore, it only supports query filters assigned to a concrete entity type.
+
+This package provides a set of extensions that allows adding multiple query filters.
+
+## Usages
+
+Add a query filter on a specific entity
+```csharp
+public void Configure(EntityTypeBuilder<MyEntity> builder)
+{
+    modelBuilder.AddQueryFilter(x => x.IsVisible);
+}
+```
+
+Add a query filter on multiple entities.
+```csharp
+protected override void OnModelCreating(ModelBuilder modelBuilder)
+{
+    modelBuilder.AddQueryFilterOnAllEntities<ISoftDeletable>(x => !x.IsDeleted);
+}
+```