Added the Code of Conduct file

CODE_OF_CONDUCT.md

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+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, ethnic origin, gender identity and expression, level of
+experience, education, socio-economic status, nationality, personal appearance,
+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
+--------------------
+
+[CoC Active Response Ensurers, or CARE][1], 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.
+
+CARE team members 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 CARE team members.
+
+Enforcement
+-----------
+
+Instances of abusive, harassing, or otherwise unacceptable behavior
+[may be reported][2] by contacting the [CARE team members][1].
+All complaints will be reviewed and investigated and will result in a response
+that is deemed necessary and appropriate to the circumstances. The CARE team is
+obligated to maintain confidentiality with regard to the reporter of an
+incident. Further details of specific enforcement policies may be posted
+separately.
+
+CARE team members who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by the
+[core team][3].
+
+Attribution
+-----------
+
+This Code of Conduct is adapted from the [Contributor Covenant version 1.4][4].
+
+[1]: https://symfony.com/doc/current/contributing/code_of_conduct/care_team.html
+[2]: https://symfony.com/doc/current/contributing/code_of_conduct/reporting_guidelines.html
+[3]: https://symfony.com/doc/current/contributing/code/core_team.html
+[4]: https://www.contributor-covenant.org/version/1/4/code-of-conduct.html