adding setup (basic)

README.md

@@ -144,6 +144,82 @@ Enter passphrase (empty for no passphrase):
 Enter same passphrase again:
 ```
 
+Now we need to use your public key with repository host normally Gitlab or Github.
+
+<details>
+<summary>Instructions for Gitlab</summary>
+
+#### Add your key
+
+- Copy the contents of your public key. If you followed the example above you can run:
+
+```cat ~/.ssh/id_rsa.pub```
+
+- Sign in to GitLab.
+- On the left sidebar, select your avatar.
+- Select Edit profile.
+- On the left sidebar, select SSH Keys.
+- Select Add new key.
+- In the Key box, paste the contents of your public key. 
+- In the Title box, type a description, like Work Laptop or Home Workstation.
+- Optional. Select the Usage type of the key. It can be used either for Authentication or Signing or both. Authentication & Signing is the default value.
+- Optional. Update Expiration date to modify the default expiration date.
+
+    - Administrators can view expiration dates and use them for guidance when deleting keys.
+    - GitLab checks all SSH keys at 01:00 AM UTC every day. It emails an expiration notice for all SSH keys that are scheduled to expire seven days from now.
+    - GitLab checks all SSH keys at 02:00 AM UTC every day. It emails an expiration notice for all SSH keys that expire on the current date. 
+
+- Select Add key. 
+
+#### Verify you can connect
+
+To ensure you’re connecting to the correct server, check the server’s SSH host keys fingerprint. For:
+
+    GitLab.com, see the SSH host keys fingerprints documentation.
+    GitLab.com or another GitLab instance, see gitlab.example.com/help/instance_configuration#ssh-host-keys-fingerprints where gitlab.example.com is gitlab.com (for GitLab.com) or the address of the GitLab instance. 
+
+- Open a terminal and run this command, replacing gitlab.example.com with your GitLab instance URL:
+```
+ssh -T git@gitlab.example.com
+```
+- If this is the first time you connect, you should verify the authenticity of the GitLab host. If you see a message like:
+```
+The authenticity of host 'gitlab.example.com (35.231.145.151)' can't be established.
+ECDSA key fingerprint is SHA256:HbW3g8zUjNSksFbqTiUWPWg2Bq1x8xdGUrliXFzSnUw.
+Are you sure you want to continue connecting (yes/no)? yes
+Warning: Permanently added 'gitlab.example.com' (ECDSA) to the list of known hosts.
+```
+- Type yes and press ``Enter``.
+- Run the ```ssh -T git@gitlab.example.com``` command again. You should receive a Welcome to GitLab, @username! message. 
+</details>
+
+<details>
+<summary>Instructions for Github</summary>
+
+#### Add your key
+
+- Copy the contents of your public key. If you followed the example above you can run:
+
+```cat ~/.ssh/id_rsa.pub```
+
+- Sign in to Github
+
+- In the upper-right corner of any page, click your profile photo, then click Settings.
+
+- In the "Access" section of the sidebar, click SSH and GPG keys.
+
+- Click New SSH key or Add SSH key.
+
+- In the "Title" field, add a descriptive label for the new key. For example, if you're using a personal laptop, you might call this key "Personal laptop".
+
+- Select the type of key, either authentication or signing.
+
+- In the "Key" field, paste your public key.
+
+- Click Add SSH key.
+
+</details>
+
 ## Advanced Setup (Highly Recommended)