Create README.md

Author: NightFeather0615

README.md

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+# Image Backend Server of It's MyPic
+![幹嘛](https://mygodata.0m0.uk/images/ave-1_25106.jpg)
+
+## API Schemas
+* Static Image `/${season}/${episode}/${frame}.${format}`
+  * `season`: String (`mygo`, `ave`, `ave-mujica`)
+  * `episode`: String (`1-3`, `4`, `5`, ..., `13`)
+  * `frame`: u32
+  * `format`: String (`jpg`, `jpeg`, `png`, `webp`)
+* Animated Image `/${season}/${episode}/${startFrame}-${endFrame}.${format}`
+  * `season`: String (`mygo`, `ave`, `ave-mujica`)
+  * `episode`: String (`1-3`, `4`, `5`, ..., `13`)
+  * `startFrame`: u32
+  * `endFrame`: u32 (`endFrame` must greater than `startFrame`)
+  * `format`: String (`gif`, `apng`, `png`, `webp`)
+    * `gif`, `webp`: Limited in 120 frames (5 seconds)
+    * `apng`, `png`: Limited in 240 frames (10 seconds)
+* (deprecated) Legacy Static Image `/${season}-${episode}_${frame}.${format}`
+  * `season`: String (`mygo`, `ave`, `ave-mujica`)
+  * `episode`: String (`1-3`, `4`, `5`, ..., `13`)
+  * `frame`: u32
+  * `format`: String (`jpg`, `jpeg`, `png`, `webp`)
+
+## Roadmap
+* [ ] Improve Animated Image Performance