Create README.md

feature/policy_forwarding/encapsulation/otg_tests/staticgueencap_and_bgp_path_selection/README.md

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+# RT-3.35 Static GUE Encap and BGP path selection
+
+## Summary
+This is to
+1. Test implementation of Static GUE encap whereby Tunnel endopoint is resolved over EBGP while the Payload's destination is learnt over IBGP
+2. Prior to being GUE encaped, the LPM lookup on the payload destination undergoes route selection between different IBGP learnt routes and selects the ones w/ higher Local preference. In the absence of which the backup routes are selected.
+3. Encaped traffic also gets the TTL and the TOS bits copied over from the inner header to the outer header. The same are verified at the other end.
+
+## Topology
+```mermaid
+graph LR; 
+subgraph DUT
+    B1[Port1]
+    B2[Port2]
+    B3[Port3]
+    B4[Port4]
+end
+subgraph ATE2
+    C1[Port1]
+    C2[Port2]
+end
+subgraph ATE3
+    E1[Port1]
+    E2[Port2]
+    E3[Port3]
+end
+subgraph ATE4
+    D1[Port1]
+    D2[Port2]
+end
+A1[ATE1:Port1] <-- IBGP(ASN100) --> B1; 
+B2 <-- IBGP(ASN100) --> C1; 
+B3 <-- EBGP(ASN100:ASN200) --> D1;  
+B4 <-- IBGP(ASN100) --> E1; 
+C2 <-- IBGP(ASN100) --> E2; 
+E3 <-- EBGP(ASN100:ASN200) --> D2;
+```