add and minor adjust README

README.md

-# practice
+<img src="assets/img/r3-training-logo.png" height="150px"/>
 
+# Advanced git course - Practice repository
+
+## How to get started?
+
+- Fork this repository by clicking on the `Fork` button on the top right of this page.
+- Clone your forked repository to your local computer.
+
+:warning: **Make sure that you have your SSH key and `git` properly configured**.
+
+```bash
+$ git clone git@github.com:<yourName>/advanced-git-practice.git
+```
+
+## Create your own branch
+
+The development scheme is based on a stable `master` branch and a development branch named `develop`.
+
+Before making changes, create your own branch from `develop`:
+```bash
+$ cd advanced-git-practice 
+$ git checkout develop # this switches the branch to develop
+$ git checkout -b myBranch # this checks out a new branch called myBranch
+```
+
+## Make your changes
+
+Copy the file `template.md` in the folder `_attendees` and rename it with your firstname:
+
+```bash
+$ cd _attendees
+$ cp template.md myName.md
+```
+
+Then, make your changes with your favorite editor!
+
+## Commit your changes and push
+
+When you are done editing your file, add the file to the stage and commit it:
+```bash
+$ git add myName.md
+$ git commit -m "Edit the content of the subpage myName.md"
+```
+
+Once you are done committing, you can push your branch to your fork:
+```
+$ git push origin myBranch
+```
+
+## Open a pull-request
+
+If you now browse to your fork on Github, you can open a pull request and submit it for review.
+
+:warning: Please make sure to select `develop` as the target branch.
+
+:warning: Watch out for comments from the reviewer! If there are things to be changed, simply change locally, commit,
+and then push again. The pull-request will update automatically.
+
+Once the pull request has been accepted, you will be able to see your page online! :tada:
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