Add docs/TEXT_HELPERS.md from Claro v1.17.26 zip

docs/TEXT_HELPERS.md

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+# Text Helpers
+
+Claro includes small text commands for beginner scripts.
+
+```claro
+TEXT UPPER "hello" AS loud
+TEXT LOWER "LOUD" AS quiet
+TEXT TRIM "  neat  " AS clean
+TEXT LENGTH clean AS size
+TEXT CONTAINS "hello world" NEEDLE "world" AS hasWord
+TEXT STARTS "Claro language" WITH "Claro" AS startsRight
+TEXT ENDS "Claro language" WITH "age" AS endsRight
+TEXT REPLACE "Hello world" FROM "world" TO "Claro" AS changed
+```