To import your existing GitHub project to Eclipse, follow below steps:
Step 1: Open Github
Step 2: From the list of repository, select the project you want to import.
Step 3: Click on Clone or Download URI and Copy URI
Step 4: Open Eclipse and Navigate to File -> Import
Step 5: Select Project from Git...
Step 6: Select Clone URI and Click Next [You can see information automatically filled]
Step 7: Enter Username and password if needed
Step 8: Select the branch in my case default is master, Click Next
Step 9: Make sure import existing project is selected
Step 10: Click Next then Finish
You can see the project on the Eclipse left side.