Update README.md (Idnan#32)

chmod function updated for beter clarity.

Author: mumararshaikh

README.md

@@ -120,6 +120,33 @@ Lets you change the read, write, and execute permissions on your files.
 ```bash
 chmod -options filename
 ```
+Syntax : (for numericals role assignment)
+```bash
+chmod nnn /path/to/file
+```
+Where n is number from 0 to 7
+
+<ul>Here,
+<li>First number is for Owner</li>
+<li>Second number is for group</li>
+<li>Third number is for Other</li>
+</ul>
+
+<b>Following number are used for permissions</b></br>
+0 - no permissions</br>
+1 - execute</br>
+2 - write</br>
+3 - write and execute</br>
+4 - read</br>
+5 - read and execute</br>
+6 - read and write</br>
+7 - read, write and execute.</br>
+
+For example to provide full access to only Owner
+
+```bash
+chmod 700 path/to/file
+```
 
 ### c. `cp`
 Copies a file from one location to other.