feat: add Outdoor Clean Theme

THEMES/Outdoor_Clean/readme.txt

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+# Outdoor_Clean — EdgeTX Theme
+
+A no-frills theme built for pilots who need to read their radio at a glance —
+not admire it. Designed around RC glider flying, where a quick scan of
+telemetry and switch states matters more than visual polish.
+
+# Design philosophy
+Clean, uncluttered, and readable. The light gray-white background
+(#F0F2F0) reduces glare in direct sunlight while keeping text sharp.
+All color choices prioritize legibility over aesthetics: a cool blue family
+carries the UI structure, a warm orange marks active states, and a strong
+red flags anything that needs immediate attention.
+The theme deliberately avoids busy backgrounds, decorative elements, and
+low-contrast color combinations. Every color earns its place by making
+information faster to read.
+
+# Compatible radios
+This theme includes background images for all EdgeTX color screen
+resolutions.
+
+# Installation
+
+Copy the Outdoor_Clean folder to THEMES/ on your SD card.
+On your radio:
+
+System Settings -> Theme → select Outdoor_Clean
+
+The correct background image for your screen size is picked
+automatically by EdgeTX.
+
+The theme requires EdgeTX 2.9 or later. For QM_BG and QM_FG support
+(quick-menu colors), EdgeTX 2.12 or later is recommended.

THEMES/Outdoor_Clean/theme.yml

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+summary:
+  name:   Outdoor_Clean
+  author: Ulrich Habel
+  info:   Light background, blueish style, orange highlights
+
+colors:
+  PRIMARY1:   0x1A2E4A
+  PRIMARY2:   0xF0F2F0
+  PRIMARY3:   0x4A6A8A
+  SECONDARY1: 0x1A2E4A
+  SECONDARY2: 0x8AAAC8
+  SECONDARY3: 0xD8E4F0
+  FOCUS:      0x1A2E4A
+  EDIT:       0x2A4A6A
+  ACTIVE:     0xE8820A
+  WARNING:    0xE8230A
+  DISABLED:   0x8AAAC8