Update README.md

README.md

@@ -93,6 +93,53 @@ ME="/koyori"
 HOME="${HO}${ME}"  # equal to HOME=/home/koyori
 ```
 
+## Installation
+
+Add `dotenv` as dependency in `build.zig.zon`:
+
+```
+.{
+    .name = "my-project",
+    .version = "0.1.0",
+    .dependencies = .{
+       .dotenv = .{
+           .url = "https://github.com/dying-will-bullet/dotenv/archive/refs/tags/v0.1.0.tar.gz",
+           .hash = "1220c77566ceedb0a89844ac490c1afe9c5e396818680e73e4a2e8dcadd9ac896724",
+       },
+    },
+}
+
+```
+
+Add `dotenv` as a module in `build.zig`:
+
+```
+diff --git a/build.zig b/build.zig
+index 957f625..66dd12a 100644
+--- a/build.zig
++++ b/build.zig
+@@ -15,6 +15,9 @@ pub fn build(b: *std.Build) void {
+     // set a preferred release mode, allowing the user to decide how to optimize.
+     const optimize = b.standardOptimizeOption(.{});
+
++    const opts = .{ .target = target, .optimize = optimize };
++    const dotenv_module = b.dependency("dotenv", opts).module("dotenv");
++
+     const exe = b.addExecutable(.{
+         .name = "tmp",
+         // In this case the main source file is merely a path, however, in more
+@@ -23,6 +26,8 @@ pub fn build(b: *std.Build) void {
+         .target = target,
+         .optimize = optimize,
+     });
++    exe.addModule("dotenv", dotenv_module);
++    // If you want to modify environment variables.
++    exe.linkSystemLibrary("c");
+
+     // This declares intent for the executable to be installed into the
+     // standard location when the user invokes the "install" step (the default
+```
+
 ## LICENSE
 
 MIT License Copyright (c) 2023, Hanaasagi