Modification to installation instructions
mkdir Code
cd Code
```
+
* clone xbeam
```
git clone -b feature-coupled-dynamic https://github.com/ImperialCollegeLondon/xbeam
```
+
* clone uvlm
```
git clone -b feature-coupled-dynamic https://github.com/ImperialCollegeLondon/uvlm
```
+
* clone sharpy
```
git clone -b feature-coupled-dynamic https://github.com/ImperialCollegeLondon/sharpy
