Add Compute The Levenshtein Distance Of Two Strings as a postgres til

postgres/compute-the-levenshtein-distance-of-two-strings.md

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+# Compute The Levenshtein Distance Of Two Strings
+
+PostgreSQL has a built-in function for computing the [Levenshtein
+distance](https://en.wikipedia.org/wiki/Levenshtein_distance) between two
+strings.
+
+```sql
+> select levenshtein('hello', 'world');
+ levenshtein
+-------------
+           4
+
+> select levenshtein('function', 'funtcion');
+ levenshtein
+-------------
+           2
+```
+
+Check out the [`fuzzystrmatch`
+module](https://www.postgresql.org/docs/current/fuzzystrmatch.html#id-1.11.7.24.6)
+for more details.