Changes to: add file

doc/gitlab-basics/add-file.md

@@ -29,16 +29,16 @@ to the desired destination:
 cd <destination folder>
 ```
 
-[Create a branch](create-branch.md) to add your file to, before it is added to the master
-(main) branch of the project. It is not strictly necessary, but working directly in
-the `master` branch is not recommended unless your project is very small, and you are
+[Create a branch](create-branch.md) to add your file to, before it's added to the master
+(main) branch of the project. It's not strictly necessary, but working directly in
+the `master` branch is not recommended unless your project is very small, and you're
 the only person working on it. You can [switch to an existing branch](start-using-git.md#work-on-an-existing-branch),
-if you have one already.
+if you've one already.
 
 Using your standard tool for copying files (for example, Finder in macOS, or File Explorer
 in Windows), put the file into a directory within the GitLab project.
 
-Check if your file is actually present in the directory (if you are in Windows,
+Check if your file is actually present in the directory (if you're in Windows,
 use `dir` instead):
 
 ```shell
@@ -79,7 +79,7 @@ Now you can push (send) your changes (in the branch `<branch-name>`) to GitLab
 git push origin <branch-name>
 ```
 
-Your image will be added to your branch in your repository in GitLab.
+Your image is added to your branch in your repository in GitLab. 
 
 <!-- ## Troubleshooting