Update README.md

0x1C-makefiles/README.md

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 # 0x1C. C - Makefiles
->Project Done in 1 Day
+>Project Done in 3 Day
 
 ![Pep8 style](https://img.shields.io/badge/PEP8-style%20guide-green?style=round-square)
 
+<p align="center">
+  <img src="assets/giphy-2.gif" width="450" title="gif">
+</p>
+
 ## Learning objectives
 > needed to be [explaied](https://fs.blog/feynman-learning-technique/) after the project.
 * What are `make`, Makefiles
@@ -20,6 +24,14 @@
 * [Tutorial](https://www.math.colostate.edu/~yzhou/computer/writemakefile.html)
 * [Using make and writing Makefiles](https://www.cs.swarthmore.edu/~newhall/unixhelp/howto_makefiles.html)
 
+## Requirements
+* Allowed editors: `vi`, `vim`, `emacs`
+* OS: `Ubuntu 20.04 LTS`
+* Version of `gcc`: 9.3.0
+* Version of `make`: GNU Make 4.2.1
+* All your files should end with a new line
+* A `README.md` file, at the root of the folder of the project, is mandatory
+
 ## Tasks
 + [x] 0\. make -f 0-Makefile <br/>_**[0-Makefile](0-Makefile)**_ Makefile that creates an executable `school` based on
   [school.c](./school.c) and [main.c](./main.c). Includes: