Add CONTRIBUTING and update README 📖

CONTRIBUTING.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, sex characteristics, gender identity and expression,
+level of experience, education, socio-economic status, nationality, personal
+appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+  advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at [email protected]. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see
+https://www.contributor-covenant.org/faq

README.md

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-![Ocelot logo](.github/jumbotron.jpg)
+<img src=".github/logo_text_dark.png" alt="Ocelot logo" height="70">
 
-# GraphQL Swift
+This is a **work in progress** implementation of the [GraphQL spec](https://github.com/facebook/graphql) written in Swift. Head over to our [Development project](https://github.com/ocelotgraphql/graphql-swift/projects/1) to see the current progress.
 
-> ⚠️ This is a **work in progress** implementation of the [GraphQL spec](https://github.com/facebook/graphql) written in Swift. Head over to our [Development project](https://github.com/ocelotgraphql/graphql-swift/projects/1) to see the current progress.
+## Contributing
+
+Ocelot is currently in it's **very early stages**. As soon as we have a clearly defined roadmap we'll label issues contribution friendly.
+You can follow the ongoing development through this repository's [GitHub project board](https://github.com/ocelotgraphql/ios/projects/1).
+
+## Installation
+
+> Unless the only thing you need is a GraphQL Lexer installing this library is not yet recommended.
+
+### Swift Package Manager
+
+As we don't have any releases yet you have to specify the `master` branch instead of a version.
+Add the following line to your `Package.swift` file's dependencies array:
+
+``` swift
+.package(url: "https://github.com/ocelotgraphql/graphql-swift", .branch("master"))
+```