Add svg support (#58)

* Add support for SVG

* Add check for SVG

* Update pattern-tree.ts

---------

Co-authored-by: Lars Kölpin-Freese <LarsKoelpin@users.noreply.github.com>

src/index.spec.ts

@@ -244,4 +244,11 @@ describe("Tests the public API", () => {
     const result = filetypemime(file);
     expect(result).toContain("image/jpeg");
   });
+
+  it("detects svg", () => {
+    // File created using https://png2jpg.com
+    const file = getBytes("a.svg");
+    const result = filetypemime(file);
+    expect(result).toContain("image/svg+xml");
+  });
 });

src/model/pattern-tree.ts

@@ -1331,4 +1331,9 @@ add(
   }
 );
 
+add("SVG", ["0x3c", "0x73", "0x76", "0x67"], {
+  mime: "image/svg+xml",
+  extension: "svg",
+});
+
 export default (): Tree => tree as Tree;