Documented Path definitions and tests in the README.

Author: Mandrenkov

src/README.md

@@ -14,6 +14,7 @@ The `h` directory implements the CTGL.  This directory contains everything neede
 | [ctgl.h](h/ctgl.h)           | Graph algorithm declarations.       |
 | [graph.h](h/graph.h)         | `Graph` data structure definitions. |
 | [list.h](h/list.h)           | `List` data structure definitions.  |
+| [path.h](h/path.h)           | `Path` data structure definitions.  |
 | [utility.h](h/utility.h)     | Template metaprogramming utilities. |
 
 The `test` directory contains unit tests for the CTGL.  Unit tests are written using the [Google Test](https://github.com/google/googletest) framework.
@@ -24,3 +25,4 @@ The `test` directory contains unit tests for the CTGL.  Unit tests are written u
 | [forge.h](test/forge.h)                       | Graph repository for testing.    |
 | [graph_test.cpp](test/graph_test.cpp)         | Unit tests for `Graph`.          |
 | [list_test.cpp](test/list_test.cpp)           | Unit tests for `List`.           |
+| [path_test.cpp](test/path_test.cpp)           | Unit tests for `Path`.           |