Add Apache 2.0 license

- Add LICENSE file with Apache 2.0 text
- Add license field to Cargo.toml
- Add copyright and SPDX headers to all source files
- Add License section to README.md

examples/function-call.rs

@@ -1,3 +1,6 @@
+// Copyright 2026 Andre Cipriani Bandarra
+// SPDX-License-Identifier: Apache-2.0
+
 use std::{env, error::Error};
 
 use geologia::prelude::{

examples/generate-content-stream.rs

@@ -1,3 +1,6 @@
+// Copyright 2026 Andre Cipriani Bandarra
+// SPDX-License-Identifier: Apache-2.0
+
 use std::{env, error::Error};
 
 use geologia::prelude::{Content, GeminiClient, GenerateContentRequest, Role};

examples/generate-content.rs

@@ -1,3 +1,6 @@
+// Copyright 2026 Andre Cipriani Bandarra
+// SPDX-License-Identifier: Apache-2.0
+
 use std::{env, error::Error};
 
 use geologia::prelude::{Content, GeminiClient, GenerateContentRequest, Role};

examples/generate-image.rs

@@ -1,3 +1,6 @@
+// Copyright 2026 Andre Cipriani Bandarra
+// SPDX-License-Identifier: Apache-2.0
+
 use std::{env, error::Error, io::Cursor};
 
 use geologia::prelude::{

examples/raw_sse.rs

@@ -1,3 +1,6 @@
+// Copyright 2026 Andre Cipriani Bandarra
+// SPDX-License-Identifier: Apache-2.0
+
 use std::env;
 
 use geologia::{