Added font guide in readme

Author: dhwanish-3

README.md

@@ -7,8 +7,7 @@ Light & simple powerline theme for Git bash for windows
 
 ## Pre-Requisites
 
-* In order for this theme to render correctly, you will need a
-[Powerline-patched font](https://github.com/powerline/fonts).
+* In order for this theme to render correctly, you will need a [Nerd font](https://github.com/ryanoasis/nerd-fonts).
 
 
 ## Installation:
@@ -21,7 +20,14 @@ mkdir -p .bash/themes/git_bash_windows_powerline
 git clone https://github.com/dhwanish-3/git-bash-powerline-theme.git .bash/themes/git_bash_powerline_theme
 ```
 
-then add the following to your .bashrc:
+Create .bashrc file in $HOME directory if you already don't have one:
+   
+```bash
+cd $HOME
+touch .bashrc
+```
+
+Then add the following lines to the end of your .bashrc file:
 
 ```bash
 # Theme