Add build.zig.zon to make repo consumable by $ zig fetch --save

Closes #8

Author: Des-Nerger

build.zig.zon

@@ -0,0 +1,13 @@
+.{
+    .name = "ziglm",
+    .version = "0.0.0",
+    .paths = .{
+        "build.zig",
+        "build.zig.zon",
+        "examples",
+        "src",
+        "test",
+        "LICENSE",
+        "README.md",
+    },
+}