Added some v1.2 BDD scenarios in Gherkin

bdd/features/delegation

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+Feature: Delegation
+
+    Rule: Delegation transaction can be constructed
+
+        Scenario: Valid case
+		    Given exchange holds some funds in my address
+		    And my chosen stake pool is registered
+		    When I provide details of my delegation intent
+		    Then exchange can construct a transaction for this delegation
+		    And the delegation transaction matches my delegation intent
+
+        Scenario: Invalid case – no funds
+	    	Given exchange holds no funds in my address
+    		When I provide details of my delegation intent
+	    	Then an error is returned (this validation may not occur until submit)
+    		And exchange cannot construct a transaction for this delegation
+
+        Scenario: Invalid case – not enough funds to delegate (less than 2ADA)
+            Given ...
+
+        Scenario: Invalid case – not my address (provide other pool id)
+            Given ...
+
+
+    Rule: Delegation transaction can be submitted
+
+        Scenario: Valid delegation transaction
+		    Given exchange holds funds in my address
+    		And exchange has constructed a valid delegation transaction
+	    	When exchange submits the transaction
+		    Then a successful response is returned
+
+        Scenario: Invalid case – stakepool not registered
+	    	Given exchange holds funds in my address
+     	    And exchange has constructed a delegation transaction using a stakepool id that is not registered
+	    	When exchange submits the transaction
+    		Then an error is returned
+	    	And delegation is not accepted on the blockchain

bdd/features/pledge-to-stakepool

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+Feature: Pledge to a stakepool
+
+    Rule: Pledging transaction can be constructed
+
+        Scenario: Valid case
+            Given there is a stakepool for which I am the owner
+            When I provide details of my pledging intent (consider using 'data table' with valid values)
+            Then exchange can construct a transaction for my pledge
+            And the delegation transaction matches my pledging intent
+
+    	Scenario: Invalid case - no enough funds to pledge
+            Given ...
+
+    	Scenario: Invalid case - stakepool not registered
+            Given ...
+
+
+    Rule: Pledging transaction can be submitted
+
+        Scenario: Valid pledging transaction
+            Given there is a stakepool for which I am the owner
+            And exchange has constructed a valid pledging transaction
+            When exchange submits the transaction
+            Then a successful response is returned
+            And pledge can be proven(?)
+
+        Scenario: Invalid case – stakepool not registered
+		    Given exchange has constructed a delegation transaction using a stakepool id that is not registered
+		    When exchange submits the transaction
+    		Then an error is returned
+    		And pledge is not accepted on the blockchain

bdd/features/register-stakepool-owner

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+Feature: Register as stakepool owner
+
+    Rule: Constructing a stakepool registration certificate (this may be client-side only and not Rosetta)
+
+        Scenario: Valid case - constructing a stakepool registration certificate
+            Given exchange holds funds in my address
+            When exchange is provided with registration details
+            Then exchange can successful construct a stakepool registration certiifcate
+
+
+    Rule: Publishing a stakepool registration certificate
+
+        Scenario: Valid case - publish stakepool registration certificate for pool that I operate
+            Given exchange holds funds in my address
+            And exchange has successfully constructed a stakepool registration certificate for pool that I operate
+            And exchange has witnessed the certificate (action not performed with Rosetta)
+            When exchange publishes this certificate
+            Then regestration transaction is accepted on the blockchain
+
+        Scenario: Valid case - publish stakepool registration certificate for a 3rd party pool
+            Given exchange holds funds in my address
+            And exchange has successfully constructed a stakepool registration certificate for a 3rd party pool
+            And exchange has witnessed the certificate (action not performed with Rosetta)
+            When exchange publishes this certificate
+           Then regestration transaction is accepted on the blockchain
+
+        Scenario: Invalid case - for a 3rd party pool (that I don't have control of?)
+            Given ...
+
+        Scenario: Invalid case - invalid witness
+            Given exchange holds funds in my address
+            And exchange has successfully constructed a stakepool registration certificate
+            And exchange has witnessed the certificate with a different key (is this possible?)
+            When exchange publishes this certificate
+            Then an error is returned
+            And regestration transaction is not accepted on the blockchain
+
+        Scenario: Invalid case - missing witness
+            Given exchange holds funds in my address
+            And exchange has successfully constructed a stakepool registration certificate
+            And exchange has not witnessed the certificate
+            When exchange publishes this certificate
+            Then an error is returned
+            And regestration transaction is not accepted on the blockchain