chore: add simple README file for YARA-X Python.

py/README.md

@@ -0,0 +1,21 @@
+This Python package allows using [YARA-X](https://virustotal.github.com/yara-x)
+from your Python programs.
+
+```python
+import yara_x
+
+rules = yara_x.compile('''
+  rule test { 
+    strings: 
+      $a = "foobar" 
+    condition: 
+      $a
+  }''')
+
+results = rules.scan(b"foobar")
+
+assert results.matching_rules[0].identifier == "test"
+assert results.matching_rules[0].patterns[0].identifier == "$a"
+assert results.matching_rules[0].patterns[0].matches[0].offset == 0
+assert results.matching_rules[0].patterns[0].matches[0].length == 6
+```