[Doc] Add discord badge on README

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/1686

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❌ 5 New Failures, 20 Unrelated Failures

As of commit fd2f64d with merge base 660afff ():

NEW FAILURES - The following jobs have failed:

• Brax Tests on Linux / unittests (3.9, 12.1) / linux-job (gh)
• D4RL Tests on Linux / unittests (3.9, 12.1) / linux-job (gh)
• Generate documentation / build_docs_job (gh)
• Robohive Tests on Linux / unittests (3.9, 12.1) / linux-job (gh)
• Unit-tests on Windows CPU / unittests / windows-job (gh)

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• Continuous Benchmark (PR) / CPU Pytest benchmark (gh)
• Continuous Benchmark (PR) / GPU Pytest benchmark (linux.4xlarge.nvidia.gpu, 3.8) (gh)
• Envpool Tests on Linux / unittests (3.9, 12.1) / linux-job (gh)
• Examples Tests on Linux / tests (3.9, 12.1) / linux-job (gh)
• Habitat Tests on Linux / tests (3.9, 11.6) / linux-job (gh)
• Jumanji Tests on Linux / unittests (3.9, 12.1) / linux-job (gh)
• Lint / c-source / linux-job (gh)
• Lint / python-source-and-configs / linux-job (gh)
• Olddeps Tests on Linux / unittests (3.8, 11.6) / linux-job (gh)
• Optdeps Tests on Linux / tests (3.9, 12.1) / linux-job (gh)
• PettingZoo Tests on Linux / unittests / linux-job (gh)
• RLHF Tests on Linux / unittests (3.9, 12.1) / linux-job (gh)
• Sklearn Tests on Linux / unittests (3.9, 12.1) / linux-job (gh)
• Tests on Linux GPU (Gym) / unittests (3.9, 12.1) / linux-job (gh)
• Unit-tests on Linux CPU / tests (3.10) / linux-job (gh)
• Unit-tests on Linux GPU / tests (3.8, 12.1) / linux-job (gh)
• Unit-tests on Linux GPU, latest stable release / tests (3.8, 11.8) / linux-job (gh)
• Unit-tests on Windows GPU / unittests / windows-job (gh)
• Vmas Tests on Linux / unittests (3.9, 12.1) / linux-job (gh)

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Continuous Benchmark / GPU Pytest benchmark (linux.4xlarge.nvidia.gpu, 3.8) (gh)

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