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README.md

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+# Env Reader
+
+This is a library to read .env files.
+
+## Usage
+- `make lib`
+
+```cpp
+
+#include <expected>
+#include <string>
+#include <print>
+
+#include "env.hpp"
+
+using std::unexpected;
+using std::expected;
+using std::println;
+using std::string;
+
+int main() {
+    Env env;
+    env.loadEnv("");
+    expected<string, string> result = env.get("FIRST");
+    if (!result.has_value()) {
+        println("{}", result.error());
+        return 1;
+    }
+
+    println("{}", result.value());
+
+    return 0;
+}
+
+```