Add build.zig for easy use as a Zig library

.gitignore

@@ -25,4 +25,5 @@ docs/assets/js/tree-sitter.js
 *.exp
 *.lib
 *.wasm
-.swiftpm
+.swiftpm
+zig-*

build.zig

@@ -0,0 +1,16 @@
+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    var lib = b.addStaticLibrary(.{
+        .name = "tree-sitter",
+        .target = b.standardTargetOptions(.{}),
+        .optimize = b.standardOptimizeOption(.{}),
+    });
+
+    lib.linkLibC();
+    lib.addCSourceFile("lib/src/lib.c", &.{});
+    lib.addIncludePath("lib/include");
+    lib.addIncludePath("lib/src");
+
+    b.installArtifact(lib);
+}