docs: prepare proposal ADR

Signed-off-by: Andrea Lamparelli <[email protected]>

Author: lampajr

docs/adr/img/adr_arch.png

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+---
+title: Performance Bot ADR
+description: ADR proposal for the performance bot integration
+---
+
+# Performance Bot Integration 
+
+## Authors
+
+- Andrea Lamparelli
+
+## Motivation
+
+This proposal aims to empower development teams by tightly integrating performance testing into their daily workflow. 
+The current model, where performance validation occurs late in the release cycle, creates a disconnect and often results 
+in unforeseen issues and urgent fixes. By enabling repositories to directly trigger performance tests from commits 
+and/or pull requests, we are bringing performance analysis closer to the developer. This 'shift-left' approach will 
+make it significantly easier and faster to pinpoint the exact changes that introduce performance regressions, 
+streamlining the development process and preventing performance-related problems from ever reaching production.
+
+## High-Level Architecture
+
+To achieve this integration, we propose to develop a modular and extensible infrastructure that serves as an agnostic 
+middleware. This system will function as a central communication bridge between source code repositories and various 
+performance testing environments.
+
+The core of this middleware will be a standardized API that decouples the repositories from the specific lab 
+implementations. 
+
+Its primary responsibilities will include:
+
+1. Receiving webhook events from repositories.
+2. Translating these events into API calls to trigger the appropriate test pipelines in a configured performance lab.
+3. Integrates with external datastore to monitor performance test results.
+4. Retrieving and formatting the performance results to be reported back to the original pull request.
+5. This pluggable architecture ensures we can easily add support for new labs or source control systems by simply 
+developing a new connector, without altering the core logic.
+
+![High-Level Architecture](img/adr_arch.png "High-Level Architecture")
+
+## Goals
+
+TBD
+
+## Architecture
+
+TBD architecture in the first implementation (coupled with GitHub, Jenkins and Horreum)
+
+### Integration with repositories
+
+TBD webhook, GitHub app configuration as well as perf-bot specific config 
+
+### Multi tenancy
+
+TBD security and isolation (one perf-bot instance per repository to integrate)
+
+## Alternatives
+
+TBD