Add examples

examples/json/json.sql

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+SELECT json_build_object(i, i)
+FROM generate_series(1, 1000) i;

examples/json/jsonb.sql

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+SELECT jsonb_build_object(i, i)
+FROM generate_series(1, 1000) i

examples/sum/gauss.sql

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+SELECT i, (i * (i + 1)) / 2 AS sum
+FROM generate_series(1, 1000) g(i);

examples/sum/recursive.sql

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+WITH RECURSIVE sums AS (
+	SELECT 1 AS i, 1 AS sum
+	UNION
+	SELECT i+1, sum+i FROM sums WHERE i <= 1000
+)
+
+SELECT * FROM sums;

examples/sum/window.sql

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+SELECT i, sum(i) OVER (ORDER BY i) AS sum
+FROM generate_series(1, 1000) g(i);

examples/unique/destroy.sql

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+DROP TABLE numbers;

examples/unique/distinct.sql

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+SELECT DISTINCT i FROM numbers;

examples/unique/group_by.sql

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+SELECT i FROM numbers GROUP BY 1;

examples/unique/init.sql

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+DROP TABLE IF EXISTS numbers;
+
+CREATE TABLE numbers AS
+SELECT * FROM generate_series(1, 10000) i;
+CREATE INDEX ON numbers(i);
+
+VACUUM ANALYZE numbers;