Update Contributing.md

Added tutorial for EasyCLA

Contributing.md

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-# Need content
+# Contribution guide
+
+
+## Pre-requisite of EasyCLA before Submitting Pull Requests (PR)
+
+In order to be able to successfully submit a pull request from your fork you need to sign with EasyCLA from Linux Foundation.  
+The video tutorial can be found [here, assuming you have submitted a PR without prior signing](https://youtu.be/WV9AD9QvSCY?si=RmA4Y-Ttk9weLJlE&t=1428), which would leave you stuck as in this screenshot.
+
+
+![easycla](https://github.com/Larissa-Health/tswg-trust-registry-protocol/assets/7843228/8c711fab-32cf-42b8-8f64-ee5e9b3ab01a)
+
+
+**Click** on the link `Please click here to be authorized` and follow the process.  
+You will have to login with your Linux Foundation ID (Account) or create a new one.  
+If you signed up with ToIP under your corporation then please select this option.  
+Don't worry, there won't be any changes to your membership payment status, meaning it will be still free of charge to use if you are a contributing member at ToIP.      
+
+The process is generally quite straight forward and if you know the DocuSign-procedure, then you can fast forward the video to minute `30:36` to see the relevant action to perform if you signed EasyCLA under a corporation.  
+
+After signing with Docusign, you will have to [connect your GitHub account with EasyCLA](https://openprofile.dev/edit/connected-accounts) (This link will get you into profile settings). 
+
+However, the system **will not** auto generate an accepted contributing user so you will have to create one through the dashboard by adding approval criteria (screenshot below).  
+After you have created an identification criterium (e.g. GitHub username or email address) for yourself your PR in GitHub will automatically be submitted.  
+
+![easycla2](https://github.com/Larissa-Health/tswg-trust-registry-protocol/assets/7843228/639ab437-d3a7-4209-8133-acc25dfeddaf)