Initial import of the CBDDC codebase with docs and tests. Add a .NET-focused gitignore to keep generated artifacts out of source control.

docs/querying.md

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+---
+layout: default
+title: Querying
+---
+
+# Querying
+
+CBDDC allows querying local collections using a rich set of operators and idiomatic C# syntax, including LINQ support.
+
+## Basic Querying
+
+You can query documents using the `Find` method on a `PeerCollection`.
+
+```csharp
+var users = await peerStore.GetCollection<User>("users");
+
+// Precise match
+var fabio = await users.Find(u => u.FirstName == "Fabio");
+
+// Comparisons
+var adults = await users.Find(u => u.Age >= 18);
+
+// Logical Operators
+var activeAdmins = await users.Find(u => u.IsActive && u.Role == "Admin");
+```
+
+## Serialization Consistency
+
+CBDDC respects your configured serialization settings. If you use `snake_case` in your JSON serialization but standard C# PascalCase properties, the query translator automatically handles the mapping.
+
+```csharp
+// Definition
+public class User 
+{
+    [JsonPropertyName("first_name")]
+    public string FirstName { get; set; }
+}
+
+// Query
+// This translates to a SQL query checking json_extract(data, '$.first_name')
+var result = await users.Find(u => u.FirstName == "Fabio");
+```
+
+## Supported Operators
+
+- `==` (Equal)
+- `!=` (Not Equal)
+- `>` (Greater Than)
+- `<` (Less Than)
+- `>=` (Greater Than or Equal)
+- `<=` (Less Than or Equal)
+- `&&` (AND)
+- `||` (OR)