docs: add gif & themes screenshots

themes/README.md

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+# Themes
+
+## cherry.ini
+[!cherry.ini theme](./screenshots/cherry.png)
+
+## default.ini
+[!default.ini theme](./screenshots/default.png)
+
+## nature.ini
+[!nature.ini theme](./screenshots/nature.png)
+
+## nord.ini
+[!nord.ini theme](./screenshots/nord.png)
+
+## old-blue.ini
+[!old-blue.ini theme](./screenshots/old-blue.png)
+
+## old-blue-thick.ini
+[!old-blue-thick.ini theme](./screenshots/old-blue-thick.png)
+
+## pure-tastelessness.ini
+[!pure-tastelessness.ini theme](./screenshots/pure-tastelessness.png)
+
+## tasteless.ini
+[!tasteless.ini theme](./screenshots/tasteless.png)
+
+## tastelessness.ini
+[!tastelessness.ini theme](./screenshots/tastelessness.png)
+