Add more Zig test programs.

tests/hellozig/floats.zig

@@ -0,0 +1,14 @@
+const std = @import("std");
+const print = std.debug.print;
+
+const a: f16 = 1.0;
+const b: f32 = 100.0;
+const c: f64 = 1_000.0;
+const d: f128 = 10_000.0;
+
+const e: comptime_float = 100_000.0;
+const f = 1_000_000.0;
+
+pub fn main() !void {
+    print("float: {}\n", .{f});
+}