Added retrieval integration, part I (#281)

app/MindWork AI Studio/Tools/RAG/IRetrievalContext.cs

@@ -0,0 +1,45 @@
+namespace AIStudio.Tools.RAG;
+
+/// <summary>
+/// The common interface for any retrieval context.
+/// </summary>
+public interface IRetrievalContext
+{
+    /// <summary>
+    /// The name of the data source.
+    /// </summary>
+    /// <remarks>
+    /// Depending on the configuration, the AI is selecting the appropriate data source.
+    /// In order to inform the user about where the information is coming from, the data
+    /// source name is necessary.
+    /// </remarks>
+    public string DataSourceName { get; init; }
+
+    /// <summary>
+    /// The category of the content, like e.g., text, audio, image, etc.
+    /// </summary>
+    public RetrievalContentCategory Category { get; init; }
+
+    /// <summary>
+    /// What type of content is being retrieved? Like e.g., a project proposal, spreadsheet, art, etc.
+    /// </summary>
+    public RetrievalContentType Type { get; init; }
+
+    /// <summary>
+    /// The path to the content, e.g., a URL, a file path, a path in a graph database, etc.
+    /// </summary>
+    public string Path { get; init; }
+
+    /// <summary>
+    /// Links to related content, e.g., links to Wikipedia articles, links to sources, etc.
+    /// </summary>
+    /// <remarks>
+    /// Why would you need links for retrieval? You are right that not all retrieval
+    /// contexts need links. But think about a web search feature, where we want to
+    /// query a search engine and get back a list of links to the most relevant
+    /// matches. Think about a continuous web crawler that is constantly looking for
+    /// new information and adding it to the knowledge base. In these cases, links
+    /// are essential.
+    /// </remarks>
+    public IReadOnlyList<string> Links { get; init; }
+}