Add new theme: Secret Garden KR (#73)

* Secret Garden KR theme with corrected structure and screenshots

* Fix: update screenshots in correct theme folder

* Add optional background sizes for Secret Garden KR theme

* chore: add to README

Author: siyeongjang

README.md

@@ -170,6 +170,9 @@ These let you play with the theme colours and generate the required files.
 ### Finca La Maria
 <img src="THEMES/Finca_La_Maria/screenshot1.png" width="240px"> <img src="THEMES/Finca_La_Maria/screenshot2.png" width="240px"> <img src="THEMES/Finca_La_Maria/screenshot3.png" width="240px">
 
+### Secret Garden KR
+<img src="THEMES/Secret_Garden_KR/screenshot1.png" width="240px"> <img src="THEMES/Secret_Garden_KR/screenshot2.png" width="240px"> <img src="THEMES/Secret_Garden_KR/screenshot3.png" width="240px">
+
 ## Description of an EdgeTX theme
 
 A theme for EdgeTX consists minimally of 5 files, all located in a dedicated subfolder (in the example here `themename`):

THEMES/Secret_Garden_KR/background_320x240.png

@@ -0,0 +1,19 @@
+---
+summary:
+  name: Secret Garden KR
+  info: Secret Garden KR Theme
+  author: "Siyeong Jang"
+  description: "A theme inspired by the tranquil beauty of Changgyeonggung Palace’s Secret Garden."
+
+colors:
+  PRIMARY1:   0x3A3D28 # 어두운 카키 (텍스트)
+  PRIMARY2:   0xF6FBEF # 밝은 배경 (노란빛 흰색)
+  PRIMARY3:   0x9DA56D # 이 이미지 기반 색상
+  SECONDARY1: 0x7F8751 # 중간 올리브
+  SECONDARY2: 0xA9B47F # 연한 카키
+  SECONDARY3: 0xC6D2A4 # 하이라이트 톤
+  FOCUS:      0x6C9966 # 초록-브라운 조화
+  EDIT:       0x4C5832 # 편집 영역 강조
+  ACTIVE:     0xB39C68 # 황토 계열 강조
+  WARNING:    0xB24C32 # 붉은 갈색 경고
+  DISABLED:   0xB0BBA4 # 연한 회녹색