feat: nearly complete

Signed-off-by: Avior <github@avior.me>

README.md

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+example command: `http://127.0.0.1:3000/?algo=total_filament_used_g%20*%200.6%20%2B%20(estimated_printing_time_seconds%20%2F%2060%20%2F%2060%20*%2040)`
+
+example decoded algo: `total_filament_used_g * 0.6 + (estimated_printing_time_seconds / 60 / 60 * 40)`, it will result in `price` being the response to the algorithm
+
+the .stl file MUST be the only thing in the body of the request
+
+Query parameters:
+
+- `algo`: the pricing algorithm
+- `config`: use another config than the default one
+
+other queries:
+- run `prusa-slicer --help-fff` in the terminal or look at the params in the response to get the full list
+
+examples:
+- `layer_height` = `0.05`
+- `scale` = `200%`
+- `fill_density` = `90%`