Create FNIC Concept

Draft PR to document FNIC

documentation/FNIC/FNIC Concept

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+DASH in 'VM' Mode
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+DASh in 'Floating NIC' Mode
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+Current Scenario:
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+Packet Flow Using NVA VM (Current Scenario)  
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+The diagram below demonstrates the current legacy scenario. 
+Here the packet flows from the source and needs to transit a VM for processing before making its way to the destination.  
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+Packet Flow USING FLOATING NIC (New Scenario)
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+The diagram below builds upon the legacy scenario. Here the NVA VM is completely removed and just a NIC exists. This NIC is termed “floating” since it is not attached to any VM.  
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+Example DPU (as Floating NIC) Accelerated Scenarios 
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+Floating NIC – PL Fast Path  
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+On-prem to Azure Connectivity via GW  
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+Example PL Fast Path: Onprem to Azure Connectivity via Sirius Appliance 
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+Floating NIC - Pl Fast Path [DPU Apliance]  
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+ON-Prem to PE CA  
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+PE-CA to Onprem