Update README.md

Author: git-user-cpp

README.md

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-# simple_password_checker
+# Simple password checker
 :key: Simple password checker is implemented in C and NASM. Created to gain experience in zero runtime programming :key:
+
+## ⚠️ LICENSE ⚠️
+MIT License
+
+Copyright (c) 2022 m!haly4
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+## 💻 How to use this app 💻
+
+1) ⚠️ **The application is designed for Linux, so avoid using other systems or remake the program to avoid bugs.** ⚠️
+2) 🗂️ Download *all* files and put them in a one directory.
+3) ⚒️ Compile the program with *nasm* and *clang* or *gcc*, whether you like.
+    - Сompilation example:
+    - first command
+    ```
+    nasm -f elf start.asm
+    
+    ```
+    - second command
+    ```
+    nasm -f elf function_call.asm
+    ```
+    - third command (creating a 32-bit object module *main.o*)
+    ```
+    clang -m32 -c main.c
+    ```
+4) 💥 Then, in your directory will appear files *"main.o, function_call.o, start.o"*.
+    - Command for linking files and creating a program
+    ```
+    ld -m elf_i386 start.o function_call.o main.o -o main
+    ```
+5) 💥 Then, in your directory will appear file *"main"*.
+    - If you want to check files in current directory
+    ```
+    ls -alR
+    ```
+    - Or
+    ```
+    ls -a -l -R
+    ```
+6) 🌠 Execute the program with command:
+    ```
+    ./main <password>
+    ```
+    - Example:
+    ```
+    ./main Hello
+    ```