vendor/curl: Add comprehensive (not-so-minimal) libcurl bindings

vendor/curl/LICENSE

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+Copyright (c) 2024-2025 Zoltán Kéri <[email protected]>
+
+Permission to use, copy, modify, and distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

vendor/curl/README.md

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+# odin-curl
+
+A minimal libcurl binding for the Odin programming language.
+
+## Requirements
+
+- Odin compiler
+- libcurl development files
+  - Ubuntu/Debian: `sudo apt install libcurl4-dev`
+  - Fedora: `sudo dnf install libcurl-devel`
+  - macOS: `brew install curl`
+  - Windows: Download from [curl](https://curl.se/windows/)
+
+## Usage
+
+```odin
+package main
+
+import "core:fmt"
+import curl "vendor:curl"
+
+main :: proc() {
+    if !curl.init() {
+        fmt.eprintln("Failed to initialize curl")
+        return
+    }
+    defer curl.cleanup()
+
+    config := curl.Request_Config{
+        headers = []string{
+            "User-Agent: odin-curl/0.1",
+        },
+    }
+
+    res := curl.get("https://httpbin.org/json", config)
+    defer curl.destroy_response(&res)
+
+    if res.error != .None {
+        fmt.eprintln("Request failed:", curl.error_string(res.error))
+        return
+    }
+
+    fmt.println("Response:", string(res.body))
+}
+```
+
+## Examples
+
+Check the `examples/` directory for:
+- Basic GET and POST requests
+- JSON handling with type-safe responses
+- Custom response parsing
+- SSL/TLS configuration
+- Memory allocation tracking
+
+## Version Compatibility
+
+This binding is based on curl.h version 8.11.1.
+
+## License
+
+ISC. See the [LICENSE](LICENSE) file for details.
+
+Copyright (c) 2024-2025 Zoltán Kéri <[email protected]>
+
+## Credits
+
+- libcurl - https://curl.se/libcurl/
+- Odin Programming Language - https://odin-lang.org/