Add C API

build.zig

@@ -41,6 +41,23 @@ pub fn build(b: *std.Build) void {
         .target = target,
     });
 
+    // Create static library
+    const lib = b.addLibrary(.{
+        .name = "zaprus",
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("src/c_api.zig"),
+            .target = target,
+            .optimize = optimize,
+            .link_libc = true,
+            .imports = &.{
+                .{ .name = "zaprus", .module = mod },
+            },
+        }),
+    });
+
+    b.installArtifact(lib);
+    lib.installHeader(b.path("include/zaprus.h"), "zaprus.h");
+
     // Here we define an executable. An executable needs to have a root module
     // which needs to expose a `main` function. While we could add a main function
     // to the module defined above, it's sometimes preferable to split business