Add base64 functions info to readme.md and supported.md

Signed-off-by: Juanjo Alvarez <[email protected]>

Author: Juanjo Alvarez

README.md

@@ -104,6 +104,8 @@ We support and actively test against certain third-party clients to ensure compa
 - `REPLACE(str,from_str,to_str)`: Returns the string str with all occurrences of the string from_str replaced by the string to_str.
 - `IFNULL(expr1, expr2)`: If expr1 is not NULL, IFNULL() returns expr1; otherwise it returns expr2.
 - `NULLIF(expr1, expr2)`: Returns NULL if expr1 = expr2 is true, otherwise returns expr1.
+- `TO_BASE64(str)`: Encodes the string str in base64 format.
+- `FROM_BASE64(str)`: Decodes the base64-encoded string str.
 
 ## Example
 

SUPPORTED.md

@@ -109,6 +109,8 @@
 - LN
 - LOG2
 - LOG10
+- TO_BASE64
+- FROM_BASE64
 
 ## Time functions
 - DAY