add some boolean operations, tests for

Signed-off-by: Ava Hahn <ava@aidanis.online>

Readme.org

@@ -127,7 +127,7 @@ This contains any executable target of this project. Notably the main shell file
 Note: this section will not show the status of each item unless you are viewing it with a proper orgmode viewer
 *** TODO Rudimentary Control Flow
 **** DONE if clause
-**** TODO let clause
+**** DONE let clause
 **** TODO while clause
 **** TODO circuit clause
 *** TODO Help function
@@ -143,22 +143,26 @@ Will need a concatenate function for tables
 *** TODO Custom ast pretty print
 *** TODO Shell module
 **** TODO Process launching with environment variables
+**** TODO Optional form of process which allows fd redirecting
 **** TODO Foreground process TTY
 **** TODO Background processes
 *** TODO list operations
+**** DONE append
+**** DONE expand
 **** TODO head (returns (head rest))
 **** TODO tail (returns (rest tail))
 **** TODO queue (append to front)
 **** TODO snippet for dequeue
 **** TODO snippet for pop
 *** TODO boolean operations
-**** TODO and (circuit)
-**** TODO or
+**** DONE and (circuit)
+**** DONE or
 **** TODO xor
-**** TODO no
+**** DONE no
 **** TODO eq?
 **** TODO toggle
 *** TODO string operations
+**** TODO typecast (string)
 **** TODO contains
 **** TODO len
 **** TODO concat
@@ -166,6 +170,8 @@ Will need a concatenate function for tables
 **** TODO split (on delimiter)
 **** TODO strcons (sprintf but its all string tokens under the hood)
 *** TODO arithmetic operations
+**** TODO typecast (int)
+**** TODO typecast (float)
 **** TODO add
 **** TODO sub
 **** TODO div