Putting your existing work on GitHub can let you share and collaborate in lots of great ways.
For adding your existing project to GitHub you need GIT BASH for downloading GIT BASH click here. Once download got completed, install it.
Create a new repository on GitHub. To avoid errors, do not initialize the new repository with README, license, or gitignore files. You can add these files after your project has been pushed to GitHub.
Open Git Bash(open the folder where existing project is present --> right click and select Git Bash Here as shown in below image)
After clicking on Git Bash below screen will open:
Enter below command in Command prompt screen
$ ls --Use to see list of file in a folder.
Initialize the local directory as a Git repository.
$ git init --Initialize the local directory as a Git repository.
At the top of your GitHub repository's Quick Setup page, click
to copy the remote repository URL.
In the Command prompt, add the URL for the remote repository where your local repository will be pushed.
$ git remote add origin <remote repository URL> --Sets the new remote
$ git remote -v --Verifies the new remote URL
Add the files in your new local repository. This stages them for the first commit.
$ git add . --Adds the files in the local repository and stages them for commit.
Commit the files that you've staged in your local repository.
$ git commit -m "First commit" --Commits the tracked changes and prepares them to be pushed to a remote repository.
Push the changes in your local repository to GitHub.
$ git push origin master --Pushes the changes in your local repository up to the remote repository you specified as the origin