Adding pathfinding using SDF example

Author: zet23t

pathfinding_sdf/README.md

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+# Combining distance fields with path finding
+
+![sdf-sample-05](https://github.com/zet23t/examples-c/assets/1007258/7e71e376-e6a8-4ee1-ae19-767d138a1b8a)
+
+This example demonstrates how to use signed distance fields (SDF) for improving
+pathfinding.
+
+* Unit size: A path may have a requirement for a minimum width to allow passage.
+  By using the SDF values, we can block paths that are too narrow for the unit.
+* Path preferences: A unit may prefer to stay close to walls or avoid them. The example
+  demonstrates how to influence the pathfinding by using the SDF values.
+* Varying step distances: Using SDF values to adjust step distances during path finding,
+  resulting in curved paths.
+
+The example is not optimized for performance, but rather to demonstrate the concept.