example: add a path finding algorithm visualizer using gg (#20060)

examples/gg/path_finding_algorithm_visualizer/LICENSE

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+MIT License
+
+Copyright (c) [2023] [Yuyi Hao]
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

examples/gg/path_finding_algorithm_visualizer/README.md

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+# A* path finding algorithm visualizer
+This is a simple visualizer for an A* path finding algorithm written in V.
+
+# Quick start 
+
+```console
+# to run:
+$ v run aStar.v
+
+# to just compile:
+$ v aStar.v
+
+# then to run:
+$ ./aStar
+```
+
+# Controls
+
+- `q` : To quit the application
+- `c`: clear the grid and start from new one 
+- `space`: initialize path finding algorithm 
+
+
+# Demo 
+![Demo image of the algorithm](screenshot.png)
+
+# 🔴🔴🔴🔴 Area of improvments 🔴🔴🔴🔴🔴
+
+- 🚧 Under Construction: We are using heap, but that is not correctly
+implemented, since instead of O(log(n)) it takes O(n). For that reason,
+having a bigger grid size, will break the application.
+
+- 🌱 Growth Opportunity: make it responsive.