File operations

* read
* write
* append
* exists?
* tests for each

Readme.org

@@ -1,3 +1,4 @@
+
 #+Title: Relish: Rusty Expressive LIsp SHell
 #+Author: Ava Hahn
 
@@ -155,13 +156,11 @@ Note: this section only tracks the state of incomplete TODO items. Having everyt
 (See tag: v0.3.0)
 ** TODO v1.0 tasks
 - islist type query
+- assert function
+- set library
 - Can pass args to relish scripts (via interpreter)
 - Can pass args to relish scripts (via command line)
 - File operations
-  - read-to-string
-  - write-to-file
-  - file exists?
-  - (path functions)
   - (add this all to the readme)
 - finish basic goals in the [[file:snippets/interactive-devel.rls][interactive development library]]
 - Release CI
@@ -170,7 +169,6 @@ Note: this section only tracks the state of incomplete TODO items. Having everyt
 - Post release to relevant channels
 ** TODO v1.1 tasks
 - finish stretch goals in the [[file:snippets/interactive-devel.rls][interactive development library]]
-- Stl boolean assert builtin
 - History length configurable (env var?)
 - Lex function
 - Read function (Input + Lex)