Add a ZIG test program.

The zig compiler is way behing on opensuse.
I tried building zig from source but encountered many compile errors.

I'll wait until opensuse is updated.

tests/hellozig/.gitignore

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+hello-zig
+assignment
+integers
+

tests/hellozig/Makefile

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+.PHONY: all
+all: hello-world assignment integers
+
+hello-world: hello-world.zig
+	zig build-exe -O Debug hello-world.zig
+
+assignment: assignment.zig
+	zig build-exe -O Debug assignment.zig
+
+integers: integers.zig
+	zig build-exe -O Debug integers.zig
+
+.PHONY: clean
+clean:
+	rm -f *.o hello-world assignment integers
+

tests/hellozig/README

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+Examples are from here:
+
+    https://zig-by-example.com/
+
+Run Seer like this. The break-function is the name of the program and ".main".
+
+    $ /usr/local/bin/seergdb -s --bf=hello-world.main ./hello-world
+
+Set the "Source" file configurations in Seer's config page.
+
+    o Add "*.zig" for valid source files.
+    o Add "/usr/lib/zig/" for "misc" files.
+
+Zig resources:
+
+    https://github.com/ziglang/zig
+    https://github.com/zigcc/awesome-zig
+

tests/hellozig/assignment.zig

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+const std = @import("std");
+
+pub fn main() !void {
+
+    const c: bool = true;
+
+    var v: bool = false;
+    v = true;
+
+    const inferred = true;
+
+    var u: bool = undefined;
+    u = true;
+
+    _ = c;
+    _ = inferred;
+}

tests/hellozig/hello-world.zig

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+const std = @import("std");
+
+pub fn main() !void {
+    std.debug.print("Hello, World!\n", .{});
+}

tests/hellozig/integers.zig

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+const std = @import("std");
+const print = std.debug.print;
+
+const a: u8 = 1;
+const b: u32 = 10;
+const c: i64 = 100;
+const d: isize = 1_000;
+
+const e: u21 = 10_000;
+const f: i42 = 100_000;
+
+const g: comptime_int = 1_000_000;
+const h = 10_000_000;
+const i = '💯';
+
+pub fn main() !void {
+    print("integer: {d}\n", .{i});
+    print("unicode: {u}\n", .{i});
+}