Initial data commit

Task/Gauss-Jordan-matrix-inversion/Java/gauss-jordan-matrix-inversion-1.java

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+// GaussJordan.java
+
+import java.util.Random;
+
+public class GaussJordan {
+    public static void main(String[] args) {
+        int rows = 5;
+        Matrix m = new Matrix(rows, rows);
+        Random r = new Random();
+        for (int row = 0; row < rows; ++row) {
+            for (int column = 0; column < rows; ++column)
+                m.set(row, column, r.nextDouble());
+        }
+        System.out.println("Matrix:");
+        m.print();
+        System.out.println("Inverse:");
+        Matrix inv = m.inverse();
+        inv.print();
+        System.out.println("Product of matrix and inverse:");
+        Matrix.product(m, inv).print();
+    }
+}