Added LEARN.md

LEARN.md

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+# GTK Passcoder
+
+![passcoder Demo](demo.gif)
+
+**Here is an overview of why this project might be of use to you, and why it even exists**
+
+**Note:** Also feel free to make suggestions, raise issues and send PRs!
+
+## What is this project about?
+
+This project started when I wanted to have a local tool for password encryption.
+
+While I could have used Python and could have had a way easier time using available libraries, I decided I'd rather make things from scratch to learn how they work.
+
+This is why, looking through, working with, or improving the project, you will learn what this project tries to implement with [commonly available libraries](#what-do-i-need).
+
+## What do I need?
+
+You need to be intermediate-level in C++14 to understand this project. You will come across:
++ Widespread use of STL functionality, including algorithms and idioms,
++ Lambda functions,
++ Templated functions
+
+You also need to understand how projects are divided into directories, headers and sources, ideally being aware of linkage properties and object/definition visibility and scope.
+
+For things you need for building, see [How do I build](#how-do-i-build).
+
+## What libraries do I need?
+
+Some popular libraries used by the project are:
++ `Boost.JSON` for reading, parsing and writing JSON,
++ `GTKmm`, a GTK wrapper API for C++,
++ `OpenSSL`, a very popular cryptographic library and tool
+
+## How does the project work?
+
+It is essential to be aware of two things:
++ This project is designed for Linux use, specifically with a window manager that supports `GTK+3`,
++ The project is not yet fully completed, although the missing functionality is minimal (strings bulk load/save, clean all fields button, hide button and clipboard function).
+
+Because of this, Windows developers may want to look elsewhere, I don't think this will easily be portable to Windows platforms.
+
+Regarding the GUI, its design is entirely external and designed using `Glade`, a very nice application for laying out widgets similar to Qt Creator.
+
+## How do I build?
+
+You need at least CMake 3.12.0 to build the project, as well as its dependencies.
+
+You will also need the previously mentioned libraries.
+
+For Debian-based systems:
+```bash
+sudo apt-get install libgtkmm-3.0-dev libboost-all-dev libssl-dev cmake
+```
+