update readme

Signed-off-by: Apoorvaa Gupta <[email protected]>

Author: apoorvaagupta

README.md

@@ -1,3 +1,48 @@
 # The-Welcome-Bot
 
-> A Github App built with [Probot](https://github.com/probot/probot) that welcomes new users in any repository.
+> A Github App built with [Probot](https://github.com/probot/probot) that welcomes new users in any repository.
+
+## Usage
+
+1. **[Configure the GitHub App](https://github.com/apps/the-welcome-bot)**
+
+A `.github/config.yml` file is required to enable custom messages. The file can override any of these default massages:
+
+```yml
+# Configuration for the-welcome-bot - https://github.com/bash-bot/the-welcome-bot
+
+# Message for a new user who open an issue
+issueOpen: >
+  Hello World! Welcome to the project!
+  Thanks and congrats for opening your very first issue in this project.
+  You may submit a PR on the same if you like!
+  Join the Slack channel or the gitter chat for discussions.
+  Hope you have a great time here :)
+
+# Message for a new user who comments on an issue
+issueComment: >
+  Hello World! Welcome to the project!
+  Thanks and congrats for your very first comment on this project.
+  Checkout the ReadMe for more details on it.
+  Want to contribute? Make an issue or submit a PR.
+  Join the Slack channel or the gitter chat for discussions.
+  Hope you have a great time here :)
+
+# Message for a new user who opens a PR
+prOpen: >
+  Hello World! Welcome to the project!
+  Thankyou and congarts for your first PR on this project.
+  We will review it soon!
+  Till then you can checkout the ReadMe for more details on it.
+  Join the Slack channel or the gitter chat for discussions.
+  Hope you have a great time here :)
+
+# Default message for a new user
+welcomeMessage: >
+  Hello World! Welcome to the project! Feel free to explore it.
+  Checkout the ReadMe for more details on it.
+  Want to contribute? Make an issue or submit a PR.
+  You can check the contributing guides and code of conduct for the same.
+  Join the Slack channel or the gitter chat for discussions.
+  Hope you have a great time here :)
+```