Adding dictionary entry using string variable as key.

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+## Adding dictionary entry using string variable as key
+
+New dictionary entry can now be added using string variable as key, 
+in addition to using string literal as key.
+
+```meson
+dict = {}
+
+# A variable to be used as a key
+key = 'myKey'
+
+# Add new entry using the variable
+dict += {key : 'myValue'}
+
+# Test that the stored value is correct 
+assert(dict[key] == 'myValue', 'Incorrect value retrieved from dictionary')
+```