added pre version of a wiki

wiki/dev/system-helping.md

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+# System helping (Contribute)
+## Rules
+You are free to contribute and propose corrections, modifications after fork. Try to respect theses rules:
+- Make sure you are up-to-date with the referent branch (most of the time the `dev` branch).
+- Clear and precise commit messages allow a quick review of the code.
+- If possible, limit yourself to one Feature per Merge request so as not to block the process.
+
+
+## Dev install
+1. Clone the repository.
+2. Use `npm ci` to install the dependence.
+3. Create a link from `<repo>/system` to your foundry system data (by default `%localappdata%/FoundryVTT/data/systems/l5r5e`).
+
+Windows exemple (modify the target and source directories, and run this in administrator) :
+```bash
+mklink /D /J "%localappdata%/FoundryVTT/data/systems/l5r5e" "D:/Projects/FVTT/l5r5e/system"
+```
+
+
+## Compiling SCSS
+1. Run `npm watch` to watch and compile the `scss` files.