Update readme.md and test file.

Author: phcoding

README.md

@@ -1 +1,39 @@
 # numjs
+```javascript
+//load lib.
+const numjs = require('./numjs');
+//create matrix a from array.
+var a = new numjs.matrix(numjs.linspace(1,9,9).array, [3,3]);
+//print matrix a.
+a.print();
+```
+> `>>> [ [ 1, 2, 3 ], [ 4, 5, 6 ], [ 7, 8, 9 ] ]`
+
+```javascript
+//create random matrix.
+var b = numjs.random(3);
+//print matrix b;
+b.print();
+```
+> `>>>`
+> `[ [ 0.8179369200338522, 0.061001336902696046, 0.2144879006316711 ],`
+> `  [ 0.5705785105308054, 0.7570802468887163, 0.4912138810045723 ],`
+> `  [ 0.7742470425300807, 0.3581051938550892, 0.0561141415278148 ] ]`
+
+```javascript
+//print result of a dot b.
+a.dot(b).print();
+```
+> `>>>`
+> `[ [ 0.8179369200338522, 0.12200267380539209, 0.6434637018950133 ],`
+> `[ 2.2823140421232218, 3.7854012344435817, 2.947283286027434 ],`
+> `[ 5.419729297710565, 2.8648415508407137, 0.5050272737503332 ] ]`
+
+```javascript
+//print result of a cross b.
+a.cross(b).print();
+```
+> `>>>`
+> `[ [ 4.281835068685705, 2.649477412245396, 1.3652580872242601 ],`
+> `[ 10.770122487969921, 6.1780377451849, 3.650705856716435 ],`
+> `[ 17.258409907254137, 9.706598078124406, 5.936153626208609 ] ]`

test.js

@@ -1,5 +1,20 @@
-var numjs = require('./numjs');
-
-var mat = numjs.nums(0,100);
-
-mat.print();
+//load numjs lib.
+const numjs = require('./numjs');
+//create matrix from array.
+var a = new numjs.matrix(numjs.linspace(1,9,9).array, [3,3]);
+//create matrix from random.
+var b = numjs.random(3);
+//create matrix from nums.
+//numjs.nums(Math.random, 3) is equal to numjs.random(3).
+var c = numjs.nums(Math.random, 3);
+//transform matrix according to given transform function.
+var d = c.trans(function(i){return i>0.5?1:-1;});
+//transpose matrix
+var e = a.transpose();
+//print matrix a and b;
+a.print();
+b.print();
+//print result of a dot b.
+a.dot(b).print();
+//print result of a cross b.
+a.cross(b).print();