message: CLI: Document output format options
diff: @@ -21,6 +21,10 @@ After installing `@stylable/cli`, a new `stc` command will be available, running
  |srcDir|source directory relative to root|`./`|
  |outDir|target directory relative to root|`./`|
  |indexFile|filename of the generated index|`false`|
  +|cjs|output commonjs modules (`.js`)|`true`|
  +|esm|output esm modules (`.mjs`)|`false`|
  +|css|output transpiled css files (`.css`)|`false`|
  +|stcss|output stylable source files (`.st.css`)|`false`|
  |customGenerator|path of a custom index file generator|-|
  |ext|extension of stylable css files|`.st.css`|
  |log|verbose log|`false`|
  