Add Capitalize All The Words as a postgres til

postgres/capitalize-all-the-words.md

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+# Capitalize All The Words
+
+PostgreSQL provides the string function `initcap()` as a way of capitalizing
+all words. In the process, it cleans up the casing of the remaining parts of
+the words.
+
+Here are some example of how it works.
+
+```sql
+> select initcap('hello, world');
+   initcap
+--------------
+ Hello, World
+
+> select initcap('HELLO, WORLD');
+   initcap
+--------------
+ Hello, World
+```
+
+See the [String Functions and Operators
+docs](https://www.postgresql.org/docs/current/static/functions-string.html)
+for more details.