docs: add pip-28 prevent node shotdowns

PIPs/pip-28.md

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+---
+pip: 28
+title: Prevent Node Shutdowns for Validators in Committee
+author: Javad Rajabzadeh (@ja7ad)
+discussion-no:
+status: Draft
+type: Standards Track
+category: Core
+created: 06-07-2024
+---
+
+## Abstract
+
+PIP-28 proposes a protocol change to prevent validators from shutting down their nodes while actively
+serving in a committee. This measure aims to ensure continuous network stability and reliability by
+maintaining the availability of validators during critical periods. By disallowing node shutdowns for
+active committee members, the proposal seeks to mitigate potential disruptions and enhance the robustness
+of the Pactus blockchain consensus mechanism.
+
+## Motivation
+
+In the current CLI version, when we stop a node, we are not informed whether the validator is in the committee.
+This oversight leads to penalties and a decrease in the validator's score. Preventing node shutdowns for active
+committee members would address this issue, ensuring validators remain operational during crucial periods and
+avoiding unintended penalties. This proposal aims to enhance the operational stability and reliability of the
+Pactus blockchain by maintaining validator participation during their committee tenure.
+
+## Specification
+
+When stopping a node, the system should check if any validators are currently in the committee. If they are,
+the user should be warn that specific validators are in the committee and informed that stopping the node will
+result in penalties and a decrease in the validator's score. This check-and-warn mechanism will help prevent
+unintentional disruptions and maintain validator performance during their committee duties.
+
+## Backwards Compatibility
+
+No backward compatibility issues found.