Add README.

README.md

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+# Graph & Algorithm projects
+
+## How to start?
+
+You will not be able to use this repository to save your work, thus you need to copy / import it to 
+your favorite repository platform.
+
+### Importing to [Github](https://github.com), [Bitbucket](https://bitbucket.org) or [Gitlab](https://gitlab.com).
+
+You first need to register on one of these platform, the steps to import the project are detailed below for each platform.
+
+#### Github
+
+1. In the upper-right corner of any page, click &#f05d;, and then click **Import repository**. 
+
+2. Paste the following URL in the first input:
+
+[https://gitea.typename.fr/INSA/be-graphes.git](https://gitea.typename.fr/INSA/be-graphes.git)
+
+3. Choose the name you want for the repository.
+
+4. Click *Begin import*.
+
+5. Wait for completion... Done!
+