Created ReadMe

Author: AivanF

README.md

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+# Virtual artist abstractionist
+
+This is a console C++ program that generates random abstract paintings in PNG format that I created in 2014.
+Here is the [main article with lots of generated pictures](http://www.aivanf.com/eng/note/virtual-artist).
+
+### Project files
+
+- `mathem.h` – some helpful functions.
+
+- `lodepng.h` / `lodepng.cpp` – PNG library created by [Lode Vandevenne](http://lodev.org/lodepng/).
+
+- `islepng.h` –  **isle** namespace and **Picture** class for images manipulations.
+
+- `mem.h` / `mem.cpp` – **mem** namespace, classes **Value**, **Number**, **Variable**, **Expression**, **Pool**,
+and functions for deep expressions creation.
+
+  Namespace **mem** is used for creation of random expression.
+Class **Value** is an abstract parent for the **Number**, **Variable**, and **Expression** classes.
+Class **Number** represents a constant number, **Variable** is a number which value may be changed from outside.
+**Expression** is linked with two **Value**s and has an operation type.
+Static class **Pool** is used for memory cleaning.
+
+  The function `Value* SetDeepValueVars(int, Value*, Value*)` recursively creates random expressions
+  with given values at the bottom level.
+
+- `main.cpp` – entry point, input handling, and generation controlling.
+
+### The algorithm of image creation
+
+1. Initially, the program creates two expressions **P** and **Q**
+with different depth and **X** and **Y** as variables.
+
+2. Then, it creates expressions **H** and **V** using **P** and **Q** as variables.
+
+3. Then, it iterates through image pixels and calculates values of **H** and **V**,
+and uses it for translation from [HSV](https://en.wikipedia.org/wiki/HSL_and_HSV) to [RGB](https://en.wikipedia.org/wiki/RGB_color_model) color model. The obtained values are used for pixels RGB colors.
+
+### License
+
+Copyright AivanF. (c) 2014-2018
+
+This code is provided 'as-is', without any express or implied
+warranty. You may not hold the author liable.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this code must not be misrepresented. You must not
+claim that you wrote the original software. When use the code, you must give appropriate credit,
+provide a link to this license, and indicate if changes were made.
+
+2. Altered source versions must be plainly marked as such, and must not be
+misrepresented as being the original software.
+
+3. This notice may not be removed or altered from any source distribution.
+