feat: Added server and documentation

INSTALL.md

@@ -415,4 +415,41 @@ You can get a Bitbucket token for your repository by following Repository Settin
 Please contact <support@codium.ai> if you're interested in a hosted BitBucket app solution that provides full functionality including PR reviews and comment handling. It's based on the [bitbucket_app.py](https://github.com/Codium-ai/pr-agent/blob/main/pr_agent/git_providers/bitbucket_provider.py) implmentation.
 
 
+### Bitbucket Server and Data Center
+
+Login into your on-prem instance of Bitbucket with your service account username and password.
+Navigate to `Manage account`, `HTTP Access tokens`, `Create Token`.
+Generate the token and add it to .secret.toml under `bitbucket_server` section
+
+```toml
+[bitbucket_server]
+bearer_token = "<your key>"
+```
+
+#### Run it as CLI
+
+Modify `configuration.toml`:
+
+```toml
+git_provider="bitbucket_server"
+```
+
+and pass the Pull request URL:
+```shell
+python cli.py --pr_url https://git.onpreminstanceofbitbucket.com/projects/PROJECT/repos/REPO/pull-requests/1 review
+```
+
+#### Run it as service
+
+To run pr-agent as webhook, build the docker image:
+```
+docker build . -t codiumai/pr-agent:bitbucket_server_webhook --target bitbucket_server_webhook -f docker/Dockerfile
+docker push codiumai/pr-agent:bitbucket_server_webhook  # Push to your Docker repository
+```
+
+Navigate to `Projects` or `Repositories`, `Settings`, `Webhooks`, `Create Webhook`.
+Fill the name and URL, Authentication None select the Pull Request Opened checkbox to receive that event as webhook.
+
+The url should be ends with `/webhook`, example: https://domain.com/webhook
+
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