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

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.