doc: add SECURITY.md and CODE_OF_CONDUCT.md (#33)

Author: andreaangiolillo

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+This project has adopted the [MongoDB Code of Conduct](https://www.mongodb.com/community-code-of-conduct).
+If you see any violations of the above or have any other concerns or questions please contact us 
+using the following email alias: [email protected].

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+Any security concerns or vulnerabilities discovered in one of MongoDB’s products or hosted services 
+can be responsibly disclosed by utilizing one of the methods described in our [create a vulnerability report](https://docs.mongodb.com/manual/tutorial/create-a-vulnerability-report/) docs page.
+
+While we greatly appreciate community reports regarding security issues, at this time MongoDB does not provide compensation for vulnerability reports.