feat: postgreact: hello world

package/c/postgreact/postgreact--0.1.sql

@@ -0,0 +1,8 @@
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION postgreact" to load this file. \quit
+
+-- Define the hello function that uses our C implementation
+CREATE FUNCTION hello()
+RETURNS text
+AS 'postgreact', 'hello'
+LANGUAGE C STRICT;