Add safe.gnosis.io.md

safe.gnosis.io.md

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+### Format
+```
+    /// @dev Returns hash to be signed by owners.
+    /// @param to Destination address.
+    /// @param value Ether value.
+    /// @param data Data payload.
+    /// @param operation Operation type.
+    /// @param safeTxGas Fas that should be used for the safe transaction.
+    /// @param dataGas Gas costs for data used to trigger the safe transaction.
+    /// @param gasPrice Maximum gas price that should be used for this transaction.
+    /// @param gasToken Token address (or 0 if ETH) that is used for the payment.
+    /// @param refundReceiver Address of receiver of gas payment (or 0 if tx.origin).
+    /// @param _nonce Transaction nonce.
+    /// @return Transaction hash.
+    function getTransactionHash(
+        address to, 
+        uint256 value, 
+        bytes data, 
+        Enum.Operation operation, 
+        uint256 safeTxGas, 
+        uint256 dataGas, 
+        uint256 gasPrice, 
+        address gasToken,
+        address refundReceiver,
+        uint256 _nonce
+    )
+```
+
+### Rx
+```
+There is currently no endpoint to pull the transactions from.
+```
+
+
+### Tx
+```
+function executeSubscription(
+        address from, //the subscriber
+        address to, //the publisher
+        address tokenAddress, //the token address paid to the publisher
+        uint256 tokenAmount, //the token amount paid to the publisher
+        uint256 periodSeconds, //the period in seconds between payments
+        uint256 gasPrice, //the amount of tokens or eth to pay relayer (0 for free)
+        bytes signature //proof the subscriber signed the meta trasaction
+    )
+        public
+        returns (bool success)
+```
+
+Please check https://github.com/gnosis/safe-contracts for further details and context.