Properly Documented Readme file is required.

1. +++ b/Readme.md
   @@ -1,26 +1,55 @@
    MSG91 SMS provides a block to send SMS form Drupal website.It provides easy integration of msg91 to be used in India.
   ...
   + * Install this module as you would normally install a contributed Drupal module.
   ...
   +   3. Go to admin/configuration/smsbymsg91 and enter values of Authentication Key,
   

   Text should manually word-wrap within around 80 cols.

2. +++ b/Readme.md
   @@ -1,26 +1,55 @@
   +   2. Install and enable this module. ¶
   

   Extra space should be removed

+++ b/Readme.md
@@ -1,26 +1,56 @@
+ * Install this module as you would normally install a contributed Drupal module.
...
+   3. Go to admin/configuration/smsbymsg91 and enter values of Authentication Key,

Text should manually word-wrap within around 80 cols.

Reviewed the patch for spelling and grammar. Formatting aligns to Drupal documentation standards. Everything looks good. Patch applied.
Marking as RTBCed.
Thank you for working on module!