docs: added select type docs

docs/syntax/types/select.md

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+# Select
+
+The `select` type can be used to define variables that accept a single option from a list of predefined options.
+
+## Basic
+
+Basic syntax for the `select` type:
+
+```yaml
+variables:
+  - name: Color
+    type: select # Set the type to select
+    options: # Define the options
+      - name: Red
+      - name: Green
+      - name: Blue
+    description: Favorite color
+template: |-
+  Your favorite color is {{ .Color }}.
+```
+
+## Custom values
+
+You can use the `value` property to define custom values for the options:
+
+```yaml
+variables:
+  - name: Color
+    type: select
+    options:
+      - name: Red
+        value: "#ff0000" # Set the value to a hex color code
+      - name: Green
+        value: "#00ff00"
+      - name: Blue
+        value: "#0000ff"
+    description: Favorite color
+template: |-
+  Your favorite color is {{ .Color }}.
+```