Merge pull request #955 from HorizenOfficial/st/SDK_1602

St/sdk 1602

doc/release/0.9.0.md

@@ -13,6 +13,39 @@ The EVM Smart Contract can invoke a Native Smart Contract function using the fol
 `delegatecall` and `callcode` cannot be used instead, they will return an error in case they are used with Native
 Smart Contracts.
 
+In addition, it is possible to use the Solidity interface describing the Native Smart Contract.
+Files with the Native Smart Contract Solidity interfaces can be found under:
+`qa/SidechainTestFramework/account/smart_contract_resources/contracts/`.
+
+Example of Native Smart Contract invocation in Solidity using low-level `staticcall` function:
+
+```
+ // ...
+address contractAddr = address(0x0000000000000000000022222222222222222222);
+(bool success, bytes memory result) = contractAddr.staticcall{gas: 100000}(
+    abi.encodeWithSignature("getAllForgersStakes()")
+);
+
+ // ...
+```
+
+Example using Solidity interface:
+
+```
+import "./ForgerStakes.sol";
+
+    // ...
+    ForgerStakes nativeContract = ForgerStakes(0x0000000000000000000022222222222222222222);
+    nativeContract.getAllForgersStakes{gas: 100000}();
+
+    // ...
+    
+```
+
+
+
+
+
 ---
 ## Update instructions from previous version
 

qa/SidechainTestFramework/account/smart_contract_resources/contracts/ForgerStakes.sol

@@ -20,4 +20,6 @@ interface ForgerStakes {
     function delegate(bytes32 publicKey, bytes32 vrf1, bytes1 vrf2, address owner) external payable returns (StakeID);
 
     function withdraw(StakeID stakeId, bytes1 signatureV, bytes32 signatureR, bytes32 signatureS) external returns (StakeID);
+
+    function openStakeForgerList(uint32 forgerIndex, bytes32 signature1, bytes32 signature2) external returns (bytes memory);
 }