added derivation_to_scalar, decodeRctSimple, estimate_rct_tx_size to Readme

README.md

@@ -222,6 +222,9 @@ generate_key_image
 generate_key_derivation
 ```
 ```
+derivation_to_scalar
+```
+```
 derive_public_key
 ```
 ```
@@ -230,10 +233,16 @@ derive_subaddress_public_key
 ```
 decodeRct
 ```
+```
+decodeRctSimple
+```
 
 ```
 estimated_tx_network_fee
 ```
+```
+estimate_rct_tx_size
+```
 
 ```
 async__send_funds