Add Skill: text-concatenation

Extracted from: https://github.com/temiroff/Blacknode.git
Score: 1.0

skills/text-concatenation/examples.md

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+# Examples: text-concatenation
+
+## Usage Example
+
+```python
+# How to use this skill
+# Inputs: text_a, text_b
+# Process: Create a Blacknode Graph instance → Add a Text node with param value set to text_a → Add a second Text node with param value set to text_b
+# Outputs: concatenated_text
+```