Add PineAPPL logo to README.md

Author: Radonirinaunimi

README.md

@@ -1,8 +1,13 @@
-[![Rust](https://github.com/NNPDF/pineappl/workflows/Rust/badge.svg)](https://github.com/NNPDF/pineappl/actions?query=workflow%3ARust)
-[![codecov](https://codecov.io/gh/NNPDF/pineappl/branch/master/graph/badge.svg)](https://codecov.io/gh/NNPDF/pineappl)
-[![Documentation](https://docs.rs/pineappl/badge.svg)](https://docs.rs/pineappl)
-[![crates.io](https://img.shields.io/crates/v/pineappl.svg)](https://crates.io/crates/pineappl)
-[![MSRV](https://img.shields.io/badge/Rust-1.80+-lightgray.svg)](docs/installation.md)
+<p align="center">
+  <img alt="PineAPPL-Logo" src="logo/pineappl-logo.png" width=200>
+</p>
+<p align="center">
+  <a href="https://github.com/NNPDF/pineappl/actions?query=workflow%3ARust"><img alt="Rust" src="https://github.com/NNPDF/pineappl/workflows/Rust/badge.svg"></a>
+  <a href="https://codecov.io/gh/NNPDF/pineappl"><img alt="codecov" src="https://codecov.io/gh/NNPDF/pineappl/branch/master/graph/badge.svg"></a>
+  <a href="https://docs.rs/pineappl"><img alt="Documentation" src="https://docs.rs/pineappl/badge.svg"></a>
+  <a href="https://crates.io/crates/pineappl"><img alt="crates.io" src="https://img.shields.io/crates/v/pineappl.svg"></a>
+  <a href="docs/installation.md"><img alt="MSRV" src="https://img.shields.io/badge/Rust-1.80+-lightgray.svg"></a>
+</p>
 
 # What is PineAPPL?