Update readme for csv parsing

README.md

@@ -16,6 +16,7 @@ A Go-based tool for modifying XML, JSON, and text documents using XPath/JSONPath
   - String manipulations
   - Date conversions
   - Structural changes
+  - CSV/TSV parsing with comments and headers
   - Whole ass Lua environment
 - **Error Handling**: Comprehensive error detection for:
   - Invalid XML/JSON
@@ -101,6 +102,87 @@ chef -xml "//item" "if tonumber(v.stock) > 0 then v.price = v.price * 0.8 end" i
 <item stock="5" price="8.00"/>
 ```
 
+### 6. CSV/TSV Processing
+The Lua environment includes CSV parsing functions that support comments, headers, and custom delimiters.
+
+```lua
+-- Basic CSV parsing
+local rows = fromCSV(csvText)
+
+-- With options
+local rows = fromCSV(csvText, {
+    delimiter = "\t",        -- Tab delimiter for TSV (default: ",")
+    hasHeaders = true,       -- First row is headers (default: false)
+    hasComments = true       -- Filter lines starting with # (default: false)
+})
+
+-- Access by index
+local value = rows[1][2]
+
+-- Access by header name (when hasHeaders = true)
+local value = rows[1].Name
+
+-- Convert back to CSV
+local csv = toCSV(rows, "\t")  -- Optional delimiter parameter
+```
+
+**Example with commented TSV file:**
+```lua
+-- Input file:
+-- #mercenary_profiles
+-- Id	Name	Value
+-- 1	Test	100
+-- 2	Test2	200
+
+local csv = readFile("mercenaries.tsv")
+local rows = fromCSV(csv, {
+    delimiter = "\t",
+    hasHeaders = true,
+    hasComments = true
+})
+
+-- Access data
+rows[1].Name  -- "Test"
+rows[2].Value -- "200"
+```
+
+## Lua Helper Functions
+
+The Lua environment includes many helper functions:
+
+### Math Functions
+- `min(a, b)`, `max(a, b)` - Min/max of two numbers
+- `round(x, n)` - Round to n decimal places
+- `floor(x)`, `ceil(x)` - Floor/ceiling functions
+
+### String Functions
+- `upper(s)`, `lower(s)` - Case conversion
+- `trim(s)` - Remove leading/trailing whitespace
+- `format(s, ...)` - String formatting
+- `strsplit(inputstr, sep)` - Split string by separator
+
+### CSV Functions
+- `fromCSV(csv, options)` - Parse CSV/TSV text into table of rows
+  - Options: `delimiter` (default: ","), `hasHeaders` (default: false), `hasComments` (default: false)
+- `toCSV(rows, delimiter)` - Convert table of rows back to CSV text
+
+### Conversion Functions
+- `num(str)` - Convert string to number (returns 0 if invalid)
+- `str(num)` - Convert number to string
+- `is_number(str)` - Check if string is numeric
+
+### Table Functions
+- `isArray(t)` - Check if table is a sequential array
+- `dump(table, depth)` - Print table structure recursively
+
+### HTTP Functions
+- `fetch(url, options)` - Make HTTP request, returns response table
+  - Options: `method`, `headers`, `body`
+  - Returns: `{status, statusText, ok, body, headers}`
+
+### Regex Functions
+- `re(pattern, input)` - Apply regex pattern, returns table with matches
+
 ## Installation
 
 ```bash