docreag: insert code of conduct on the front page

Author: jvdp1

API-doc-FORD-file.md

@@ -84,6 +84,11 @@ The goal of the Fortran Standard Library is to achieve the following general sco
   transform, random numbers, statistics, ordinary differential equations,
   numerical integration, optimization, ...)
 
+Code of Conduct
+===============
+
+In the interest of fostering an open and welcoming environment, we as contributors and maintainers pledge to make 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. Please read first [this Code of Conduct](./page/contributing/CodeOfConduct.html)
+
 License
 =======