CONTRIBUTING.md file for GitHub - corrected

CONTRIBUTING.md file for this Community Group's GitHub repository.

#### CONTRIBUTING.md file for GitHub repository.


This repository is being used for work in the W3C Web NFC Community 
Group.  All contributions are made under the W3C CLA 
<https://www.w3.org/community/about/agreements/cla/>. To contribute, you 
must join the W3C Web NFC Community Group at 
https://www.w3.org/community/web-nfc/ .

We intend to reject Pull Requests from anyone who has not joined the 
Community Group (which requires agreement to the terms of the W3C CLA).  
If any Pull Requests from you are inadvertently accepted and you are not 
a W3C Web NFC Community Group member, the act of making a pull request 
indicates that you represent that you have received permission to make 
Contributions on behalf of that your employer and that the Contribution 
is made under the terms of the W3C CLA.


#### end