Added jenkins details

jenkin/credentials.md

@@ -0,0 +1,33 @@
+# Credentials
+
+## SSH
+
+Switch to the jenkins user:
+
+```bash
+
+sudo su - jenkins
+```
+
+Generate the SSH key (if not already created):
+
+```bash
+
+ssh-keygen -t rsa -b 4096 -C "[email protected]"
+
+```
+
+Save the key in the default location (`/var/lib/jenkins/.ssh/id_rsa`) and provide a passphrase if needed.
+
+Copy the SSH public key to GitHub:
+
+```
+cat ~/.ssh/id_rsa.pub
+```
+
+Copy the content of the public key and add it to GitHub under Settings > SSH and GPG keys > New SSH Key.
+
+
+Go to jenkins, and add the `Private` key to credentials
+
+!> Need to add known host. If you don't know, how to just clone any repo, it will prompt yes/No. Press `YES`

jenkin/jenkins.md

@@ -1,6 +1,8 @@
 # Jenkins
- * [Install Jenkin](jenkin/installation.md)
- * [Config with Private IP](jenkin/config_with_private_ip.md)
- * [Email Integration/notification](jenkin/Email%20Integration.md)
- * [Install jenkin on docker](jenkin/jenkin_on_docker.md)
- * [Troubleshoot](jenkin/Troubleshoot.md)
+
+* [Install Jenkin](jenkin/installation.md)
+* [Config with Private IP](jenkin/config_with_private_ip.md)
+* [Email Integration/notification](jenkin/Email%20Integration.md)
+* [Credentials](jenkins/credentials.md)
+* [Install jenkin on docker](jenkin/jenkin_on_docker.md)
+* [Troubleshoot](jenkin/Troubleshoot.md)