Add README and community documentation

Author: clarissalimab

CODEOWNERS

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+# Lines starting with '#' are comments.
+# Each line is a file pattern followed by one or more owners.
+
+# More details are here: https://help.github.com/articles/about-codeowners/
+
+# The '*' pattern is global owners.
+
+# Order is important. The last matching pattern has the most precedence.
+# The folders are ordered as follows:
+
+# In each subsection folders are ordered first by depth, then alphabetically.
+# This should make it easy to add new rules without breaking existing ones.
+
+# Global rule:
+* @clarissalimab

CODE_OF_CONDUCT.md

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+# Code of conduct
+
+By participating in this project, you agree to abide by the
+[thoughtbot code of conduct][1].
+
+[1]: https://thoughtbot.com/open-source-code-of-conduct

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) Clarissa Borges and thoughtbot, inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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+# OpenTelemetry RubyLLM Instrumentation
+
+OpenTelemetry instrumentation for [RubyLLM](https://rubyllm.com).
+
+## How do I get started?
+
+Install the gem using:
+
+```sh
+gem opentelemetry-instrumentation-ruby_llm
+```
+
+Or, if you use [bundler](https://bundler.io/), include `opentelemetry-instrumentation-ruby_llm` in your `Gemfile`.
+
+## Usage
+
+To use the instrumentation, call `use` with the name of the instrumentation:
+
+```ruby
+OpenTelemetry::SDK.configure do |c|
+  c.use 'OpenTelemetry::Instrumentation::RubyLLM'
+end
+```
+
+Alternatively, you can also call `use_all` to install all the available instrumentation.
+
+```ruby
+OpenTelemetry::SDK.configure do |c|
+  c.use_all
+end
+```
+
+## What's traced?
+
+| Feature | Status |
+|---------|--------|
+| Chat completions | Supported |
+| Tool calls | Supported |
+| Error handling | Supported |
+| Embeddings | Planned |
+| Streaming | Planned |
+
+This gem follows the [OpenTelemetry GenAI Semantic Conventions](https://opentelemetry.io/docs/specs/semconv/gen-ai/gen-ai-spans/).
+
+## License
+
+Copyright (c) Clarissa Borges and thoughtbot, inc.
+
+This gem is free software and may be redistributed under the terms specified in the [LICENSE](LICENSE) file.