README: add code of conduct

Signed-off-by: Miroslav Bajtoš <mbajtoss@gmail.com>

Author: bajtos

README.md

@@ -13,3 +13,17 @@ management.
 3. Open a pull request to capture outcome of a discussion in a markdown file.
    Allow at least 3 business days for other maintainers to review the proposal
    before landing.
+
+## Code of conduct
+
+See LoopBack's [Governance
+Principles](https://loopback.io/doc/en/contrib/Governance.html#principles):
+
+> LoopBack is an open, inclusive, and tolerant community of people working
+> together to build a world-class Node framework and tools. We value diversity
+> of individuals and opinions, and seek to operate on consensus whenever
+> possible. We strive to maintain a welcoming, inclusive, and harassment-free
+> environment, regardless of the form of communication. When consensus is not
+> achievable, we defer to the owners of each individual module; the powers of
+> the individual owner are kept in check by the ability of the community to
+> fork and replace dependencies on the individual module and maintainer.