Add READMEs for Java, Node.js, and C# tutorials. Add files for Node.js

samples/tutorials/node.js/macOS/SqlServerColumnstoreSample/CreateSampleTable.sql

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+WITH a AS (SELECT * FROM (VALUES(1),(2),(3),(4),(5),(6),(7),(8),(9),(10)) AS a(a))
+SELECT TOP(5000000)
+ROW_NUMBER() OVER (ORDER BY a.a) AS OrderItemId
+,a.a + b.a + c.a + d.a + e.a + f.a + g.a + h.a AS OrderId
+,a.a * 10 AS Price
+,CONCAT(a.a, N' ', b.a, N' ', c.a, N' ', d.a, N' ', e.a, N' ', f.a, N' ', g.a, N' ', h.a) AS ProductName
+INTO Table_with_5M_rows
+FROM a, a AS b, a AS c, a AS d, a AS e, a AS f, a AS g, a AS h;