Create execution_modes.rst

docs/execution_modes.rst

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+Plan
+====
+
+* ``per_gpu``: used for mono gpu benchmarks, spawn one process per gpu and run the same benchmark
+
+.. code-block:: yaml
+
+  _torchvision:
+    inherits: _defaults
+    definition: ../benchmarks/torchvision
+    group: torchvision
+    install_group: torch
+    plan:
+      method: per_gpu
+
+* ``njobs``: used to launch a single jobs that can see all the gpus.
+
+.. code-block:: yaml
+
+  _torchvision_ddp:
+    inherits: _defaults
+    definition: ../benchmarks/torchvision_ddp
+    group: torchvision
+    install_group: torch
+    plan:
+      method: njobs
+      n: 1
+
+
+Milabench processes overview
+----------------------------
+
+* milabench main process
+  * gather metrics 
+
+* milabench launches a new benchmark process
+  * milabench launch monitoring processes
+  * torchrun will launch one process per GPU