Added Zig build system

Author: glingy

.gitignore

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+zig-cache
+zig-out

.gitmodules

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+const std = @import("std");
+
+pub fn build(b: *std.Build) !void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    const openssl = b.dependency("openssl", .{});
+
+    const lib = b.addStaticLibrary(.{
+        .name = "uSockets",
+        .target = target,
+        .optimize = optimize,
+        .root_source_file = .{ .path = "src/bsd.c" },
+    });
+
+    lib.defineCMacro("WITH_OPENSSL", null);
+
+    lib.addCSourceFiles(&.{
+        "src/context.c",
+        "src/loop.c",
+        "src/quic.c",
+        "src/socket.c",
+        "src/udp.c",
+        "src/crypto/openssl.c",
+        "src/eventing/epoll_kqueue.c",
+        "src/eventing/gcd.c",
+        "src/eventing/libuv.c",
+        "src/io_uring/io_context.c",
+        "src/io_uring/io_loop.c",
+        "src/io_uring/io_socket.c",
+    }, &.{});
+
+    lib.addCSourceFiles(&.{
+        "src/crypto/sni_tree.cpp",
+    }, &.{
+        "-std=c++17",
+    });
+
+    lib.linkLibCpp();
+    lib.linkLibC();
+
+    lib.addIncludePath(.{ .path = "capi" });
+    lib.addIncludePath(.{ .path = "src" });
+
+    lib.linkLibrary(openssl.artifact("ssl"));
+    lib.installHeader("src/libusockets.h", "libusockets.h");
+
+    b.installArtifact(lib);
+}

boringssl

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+.{
+    .name = "uSockets",
+    .version = "0.1.0",
+    .dependencies = .{
+        .openssl = .{
+            .url = "https://github.com/glingy/openssl-zig/archive/refs/tags/3.2.0.tar.gz",
+            .hash = "1220ca81080e68055343edac34deb514dad1d10e61df46ae71aff6a241b9224b72db",
+        },
+    },
+}