Refactor fw_rules_xml.py to use match/case and fix multiple parsing bugs

.gitignore

@@ -2,4 +2,6 @@
 /*.json
 /*.xml
 /*.code-workspace
-/.vscode
+/.vscode
+__pycache__/
+*.pyc

README.md

@@ -1,6 +1,37 @@
 # Juniper Firewall Configuration XML to Excel xlsx
 
-This is script is to make Juniper SRX firewall XML exports more readable in excel format, better for validation processes.
+This script makes Juniper SRX firewall XML exports more readable in Excel format, better for validation processes.
 
-The file need to have the name srx.xml and needs to be in the same directory as the script.
-Will output a file called test.xlsx.
+## Usage
+
+```bash
+python3 fw_rules_xml.py -i <inputfile> -o <outputfile>
+```
+
+### Options
+
+- `-i, --input`: Input XML file (default: srx.xml)
+- `-o, --output`: Output Excel file (default: test.xlsx)
+- `-h`: Show help message
+
+### Examples
+
+```bash
+# Using default files (srx.xml -> test.xlsx)
+python3 fw_rules_xml.py
+
+# Specifying custom input and output files
+python3 fw_rules_xml.py -i config.xml -o output.xlsx
+
+# Show help
+python3 fw_rules_xml.py -h
+```
+
+## Output
+
+The script generates an Excel workbook with the following sheets:
+- **Addresses**: Individual address objects
+- **Address-sets**: Groups of addresses
+- **Policies**: Security policies with source/destination zones and match criteria
+- **Applications**: Application definitions
+- **Application-sets**: Groups of applications