Refactor entire codebase and rewrite documentation

Sources/DataLiteCore/Protocols/SQLiteRepresentable.swift

@@ -0,0 +1,35 @@
+import Foundation
+
+/// A protocol whose conforming types can be initialized from raw SQLite values.
+///
+/// This protocol extends ``SQLiteBindable`` and adds an initializer for converting a raw SQLite
+/// value into the corresponding type.
+///
+/// ```swift
+/// struct Device: SQLiteRepresentable {
+///     var model: String
+///
+///     var sqliteValue: SQLiteValue {
+///         return .text(model)
+///     }
+///
+///     init?(_ value: SQLiteValue) {
+///         switch value {
+///         case .text(let value):
+///             self.model = value
+///         default:
+///             return nil
+///         }
+///     }
+/// }
+/// ```
+public protocol SQLiteRepresentable: SQLiteBindable {
+    /// Initializes an instance from a raw SQLite value.
+    ///
+    /// The initializer should map the provided raw SQLite value to the corresponding type.
+    /// If the conversion is not possible (for example, the value has an incompatible type),
+    /// the initializer should return `nil`.
+    ///
+    /// - Parameter value: The raw SQLite value to convert.
+    init?(_ value: SQLiteValue)
+}