feat: add catppuccin_minimal theme (#35)

lua/hardline/themes/catppuccin_minimal.lua

@@ -0,0 +1,79 @@
+local colors = {
+  transparent = {gui = 'NONE', cterm = '16', cterm16 = '0'},
+  grey_medium = {gui = '#1E1E2E', cterm = '17', cterm16 = '0'},
+  grey_inactive = {gui = '#7E84A0', cterm = '61', cterm16 = '8'},
+  grey_light = {gui = '#969DBC', cterm = '69', cterm16 = '7'},
+  black = {gui = '#07070A', cterm = '16', cterm16 = '0'},
+  white = {gui = '#AEB7D9', cterm = '189', cterm16 = '15'},
+  red = {gui = '#F38BA8', cterm = '218', cterm16 = '9'},
+  yellow = {gui = '#F9E2AF', cterm = '223', cterm16 = '11'},
+}
+
+local inactive = {
+  guifg = colors.grey_inactive.gui,
+  guibg = colors.transparent.gui,
+  ctermfg = colors.grey_inactive.cterm,
+  ctermbg = colors.transparent.cterm,
+}
+
+local common_light = {
+  guifg = colors.black.gui,
+  guibg = colors.grey_light.gui,
+  ctermfg = colors.black.cterm,
+  ctermbg = colors.grey_light.cterm,
+}
+
+local common_dark = {
+  guifg = colors.white.gui,
+  guibg = colors.grey_medium.gui,
+  ctermfg = colors.white.cterm,
+  ctermbg = colors.grey_medium.cterm,
+}
+
+return {
+  mode = {
+    inactive = inactive,
+    normal = common_light,
+    insert = common_light,
+    replace = common_light,
+    visual = common_light,
+    command = common_light,
+  },
+  low = {
+    active = common_dark,
+    inactive = inactive,
+  },
+  med = {
+    active = common_dark,
+    inactive = inactive,
+  },
+  high = {
+    active = common_dark,
+    inactive = inactive,
+  },
+  error = {
+    active = {
+      guifg = colors.red.gui,
+      guibg = colors.grey_medium.gui,
+      ctermfg = colors.red.cterm,
+      ctermbg = colors.grey_medium.cterm,
+    },
+    inactive = inactive,
+  },
+  warning = {
+    active = {
+      guifg = colors.yellow.gui,
+      guibg = colors.grey_medium.gui,
+      ctermfg = colors.yellow.cterm,
+      ctermbg = colors.grey_medium.cterm,
+    },
+    inactive = inactive,
+  },
+  bufferline = {
+    separator = inactive,
+    current = common_light,
+    current_modified = common_light,
+    background = inactive,
+    background_modified = inactive,
+  },
+}