add bindings and fix documentation

bindings/swift/TreeSitterDjango/django.h

@@ -0,0 +1,16 @@
+#ifndef TREE_SITTER_DJANGO_H_
+#define TREE_SITTER_DJANGO_H_
+
+typedef struct TSLanguage TSLanguage;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+const TSLanguage *tree_sitter_django(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // TREE_SITTER_DJANGO_H_

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")
+    }
+}