Add PageRank algorithm (#1052)

Author: BSZKaneki

DIRECTORY.md

@@ -202,6 +202,7 @@
     * [Lee Breadth First Search](https://github.com/TheAlgorithms/Rust/blob/master/src/graph/lee_breadth_first_search.rs)
     * [Lowest Common Ancestor](https://github.com/TheAlgorithms/Rust/blob/master/src/graph/lowest_common_ancestor.rs)
     * [Minimum Spanning Tree](https://github.com/TheAlgorithms/Rust/blob/master/src/graph/minimum_spanning_tree.rs)
+    * [Page Rank](https://github.com/TheAlgorithms/Rust/blob/master/src/graph/page_rank.rs)
     * [Prim](https://github.com/TheAlgorithms/Rust/blob/master/src/graph/prim.rs)
     * [Prufer Code](https://github.com/TheAlgorithms/Rust/blob/master/src/graph/prufer_code.rs)
     * [Strongly Connected Components](https://github.com/TheAlgorithms/Rust/blob/master/src/graph/strongly_connected_components.rs)

src/graph/mod.rs

@@ -20,6 +20,7 @@ mod kosaraju;
 mod lee_breadth_first_search;
 mod lowest_common_ancestor;
 mod minimum_spanning_tree;
+mod page_rank;
 mod prim;
 mod prufer_code;
 mod strongly_connected_components;
@@ -49,6 +50,7 @@ pub use self::kosaraju::kosaraju;
 pub use self::lee_breadth_first_search::lee;
 pub use self::lowest_common_ancestor::{LowestCommonAncestorOffline, LowestCommonAncestorOnline};
 pub use self::minimum_spanning_tree::kruskal;
+pub use self::page_rank::page_rank;
 pub use self::prim::{prim, prim_with_start};
 pub use self::prufer_code::{prufer_decode, prufer_encode};
 pub use self::strongly_connected_components::StronglyConnectedComponents;