Add Zig with C example

zig-with-c/.gitignore

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+zig-out/
+.zig-cache/

zig-with-c/build.zig

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+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    const exe = b.addExecutable(.{
+        .name = "zig-with-c",
+        .root_source_file = b.path("src/main.zig"),
+        .target = target,
+        .optimize = optimize,
+        .use_llvm = false,
+        .use_lld = false,
+    });
+
+    exe.addCSourceFile(.{
+        .file = b.path("src/lib.c"),
+    });
+
+    exe.addIncludePath(b.path("include"));
+    b.installArtifact(exe);
+
+    const run_exe = b.addRunArtifact(exe);
+    const run_step = b.step("run", "Run the application");
+
+    run_step.dependOn(&run_exe.step);
+}

zig-with-c/include/lib.h

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+int add(int a,
+        int b);

zig-with-c/src/lib.c

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+int add(int a,
+        int b)
+{
+    return a + b;
+}

zig-with-c/src/main.zig

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+const std = @import("std");
+const c = @cImport({
+    @cInclude("lib.h");
+});
+
+pub fn main() void {
+    std.debug.print("Hello!\n", .{});
+    std.debug.print("{}\n", .{c.add(3, 5)});
+}