Add readme, code of conduct and license

Author: mattgodbolt

CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+**Compiler Explorer** 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, gender identity and expression,
+ level of experience, 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 owner at
+ [[email protected]](mailto:[email protected]). The project team will review
+ and investigate all complaints, and will respond in a way that it deems
+ 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 [contributor-covenant.org/version/1/4][version]
+
+[homepage]: https://www.contributor-covenant.org/
+[version]: https://www.contributor-covenant.org/version/1/4/

LICENSE

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+Copyright (c) 2012-2019, Compiler Explorer Authors
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without 
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright notice, 
+      this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright 
+      notice, this list of conditions and the following disclaimer in the 
+      documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
+POSSIBILITY OF SUCH DAMAGE.

README.md

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+### Miscellaneous tool build scripts
+
+The repository is part of the [Compiler Explorer](https://godbolt.org/) project. It builds
+the docker images used to build some of the more...esoteric...tools used on the site.
+
+For example, it builds the 6502 compiler.