add bindings and fix documentation

bindings/swift/TreeSitterDjangoTests/TreeSitterDjangoTests.swift

@@ -0,0 +1,12 @@
+import XCTest
+import SwiftTreeSitter
+import TreeSitterDjango
+
+final class TreeSitterDjangoTests: XCTestCase {
+    func testCanLoadGrammar() throws {
+        let parser = Parser()
+        let language = Language(language: tree_sitter_django())
+        XCTAssertNoThrow(try parser.setLanguage(language),
+                         "Error loading Django Parser grammar")
+    }
+}