Fixed printf and VGA driver bugs, also added README

README.md

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+# iceOS
+iceOS is a x86 monolithic kernel written in C from scratch.  
+This project doesn't aim to be a fully functional operating system
+with tons of drivers and graphical applications, it's just a learning tool to teach myself concepts like Operating Systems, Computer Architecture and Digital Electronics.
+
+## Installation
+### Requirements
+Before generating an ISO you have to compile a [cross compiler](https://wiki.osdev.org/GCC_Cross-Compiler) and you also have to install those packets:
+
+- nasm
+- bochs
+- grub
+- mtools(if you are on Arch Linux)
+
+Then you can run those commands:
+1. Type `./build.sh` to compile the system and to create an ISO
+2. Type `make run` to start it in QEMU or `make bochs` to start it with bochs(only for debug purposes).
+
+## Features
+iceOS already have/will have the following features:  
+- [x] Bare metal booting;
+- [x] VGA driver;
+- [ ] Interrupts implementation;
+- [ ] PIC & PIT implementation;
+- [ ] PS2 driver;
+- [ ] Support for x86 architecture;
+- [x] GRUB as bootloader.
+
+
+## Resources
+This project is made with different kind of resources and different kind of knowledges, before starting it i read/studied the following resources:
+
+- [Structured Computer Organization - Tanenbaum (2013)](https://www.pearson.it/opera/pearson/0-5585-architettura_dei_calcolatori_6ed)
+- [Operating System Concepts - Silberschatz (2016)](https://www.amazon.it/Sistemi-operativi-Concetti-ed-esempi/dp/8865183713/ref=pd_lpo_sbs_14_img_1?_encoding=UTF8&psc=1&refRID=4A5T2C7KKH7RA0K1T7RV)
+- [The Art Of Electronics - Horowitz (2015)](https://www.amazon.it/gp/product/0521809266/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1)
+- [OSDev wiki](https://wiki.osdev.org/Main_Page)
+## License
+iceOS is released under GPLv3, you can obtain a copy of this license by cloning the repository or by visiting [this](https://opensource.org/licenses/GPL-3.0) page.