[Function] Implement algorithm which add precision points on curve's edges

[Jan-Sandr]

Story:

Application's calculation process is limited to 2 decimal places. For most graphs it is enough but there are some where this limitation is visible problem. Most common is logarithm and it is even worse when base is high. Another example where it is visible: √(sin(x)) Try to implement algorithm that calculate few more points for beginning and end of the curve.

To do:

• [x] Algorithm

[Jan-Sandr]

In future I plan to replace it with something like equation analyzator which will return key points for x. For basic usage this is enough :)