(feat): configuration, readme, screenshots

.gitignore

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+Iosevka
+

README.md

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+# Iosevka ST
+
+Custom build of the [Iosevka](https://github.com/be5invis/Iosevka) font.
+
+## Character styles
+
+Based of default configuration with changes:
+
+- `D` with more rounded shape; without serifs
+- `G` with tootheless (corner) body, and inward hook terminal; without top serif
+- `I` with short serifs
+- `W` with curly body; without serifs
+- `f` with flat top hook, descending extension, and crossbar at X-height
+- Serifed `i` (default for Upright), to override default italic
+- `k` with standard shape; without serifs, to override default italic
+- Serifed `l` (default for Upright), to override default italic
+- `t` with body with flat hook, and a shorter neck
+- `w` with curly body; without serifs
+- `y` with straight shape, and a tail turns leftward; without serifs
+- Greek small Lambda (`λ`) with straight upper and a tail turns leftward
+- Cyrillic Capital Lower Zhe (`Ж`) with curly legs
+- Cyrillic Lower Zhe (`ж`) with curly legs
+- Cyrillic Capital Ze (`З`) with serif at both top and bottom, to distinguish from `3`
+- Cyrillic Capital Ka (`К`) with straight shape; without serifs
+- Cyrillic Lower Ka (`к`) with straight shape; without serifs
+- Cyrillic Lower Ef (`ф`) with standard shape and without serifs, to override default italic
+- Zero (`0`) with oval shape; without slash
+- `2` with straight neck
+- `4` with closed contour
+- `5` with an oblique upper-left bar
+- `8` looks like two circles joined together
+- `9` with a more open contour
+- Asterisk (`*`) with five-pointed shape, and medium position
+- Higher circumflex `^`
+- Parenthesis with larger contour, like that in Monaco
+- More straight braces
+- Number sign with slanted bars
+- At symbol (`@`) with four-fold body
+- Dollar symbol with interrupted strike-through vertical bar
+- Percent % with rings and continuous bar
+
+## Ligations
+
+- Vertically align some of the operators (like `*`) to the center position it is before or after a "center" operator (like `+`).
+- Plus (`+`) and Minus (`-`) will trigger other operator characters at left to be centered.
+- Plus (`+`) and Minus (`-`) will trigger other operator characters at right to be centered.
+- Equal (`=`) will trigger other operator characters at left to be centered.
+- Equal (`=`) will trigger other operator characters at right to be centered.
+- Less (`<`) and Greater (`>`) will trigger other operator characters at inside to be centered.
+- Less (`<`) and Greater (`>`) will trigger other operator characters at outside to be centered.
+- Treat colon (`:`) as operator and perform chained centering.
+- Move connecting dotty punctuations closer, like for `::`, `:::` and `...`.
+- Move consecutive bars closer, like for `||`, `|||` and `//`.
+
+## Shape
+
+- Bold is one step bolder than standard.
+
+## Screenshots
+
+![Highlighted characters](screenshot_iosevka-customizer-highlight.png?raw=true)
+![All characters](screenshot_iosevka-customizer-all.png?raw=true)

private-build-plans.toml

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+[buildPlans.iosevka-st]
+family = "Iosevka ST"
+spacing = "normal"
+serifs = "sans"
+no-cv-ss = true
+export-glyph-names = false
+
+[buildPlans.iosevka-st.variants.design]
+capital-d = "more-rounded-serifless"
+capital-g = "toothless-corner-serifless-hooked"
+capital-i = "short-serifed"
+capital-w = "curly-serifless"
+f = "flat-hook-serifless-crossbar-at-x-height"
+i = "serifed"
+k = "straight-serifless"
+l = "serifed"
+t = "flat-hook-short-neck"
+w = "curly-serifless"
+y = "straight-turn-serifless"
+lower-lambda = "straight-turn"
+cyrl-capital-zhe = "curly"
+cyrl-zhe = "curly"
+cyrl-capital-ze = "bilateral-serifed"
+cyrl-capital-ka = "straight-serifless"
+cyrl-ka = "straight-serifless"
+cyrl-ef = "serifless"
+zero = "oval-unslashed"
+two = "straight-neck"
+four = "closed"
+five = "oblique-upper-left-bar"
+eight = "two-circles"
+nine = "open-contour"
+asterisk = "penta-mid"
+caret = "high"
+paren = "large-contour"
+brace = "straight"
+number-sign = "slanted"
+at = "fourfold"
+dollar = "interrupted"
+percent = "rings-continuous-slash"
+
+[buildPlans.iosevka-st.variants.italic]
+f = "flat-hook-tailed-crossbar-at-x-height"
+
+[buildPlans.iosevka-st.ligations]
+enables  = [
+  "center-ops",
+  "center-op-trigger-plus-minus-l",
+  "center-op-trigger-plus-minus-r",
+  "center-op-trigger-equal-l",
+  "center-op-trigger-equal-r",
+  "center-op-trigger-angle-inside",
+  "center-op-trigger-angle-outside",
+  "center-op-influence-colon",
+  "kern-dotty",
+  "kern-bars"
+]
+
+[buildPlans.iosevka-st.weights.regular]
+shape = 400
+menu = 400
+css = 400
+
+[buildPlans.iosevka-st.weights.medium]
+shape = 500
+menu = 500
+css = 500
+
+[buildPlans.iosevka-st.weights.semibold]
+shape = 700
+menu = 600
+css = 600
+
+[buildPlans.iosevka-st.weights.bold]
+shape = 800
+menu = 700
+css = 700
+
+[buildPlans.iosevka-st.weights.extrabold]
+shape = 900
+menu = 800
+css = 800
+
+[buildPlans.iosevka-st.slopes.upright]
+angle = 0
+shape = "upright"
+menu = "upright"
+css = "normal"
+
+[buildPlans.iosevka-st.slopes.italic]
+angle = 9.4
+shape = "italic"
+menu = "italic"
+css = "italic"
+