add config tips for windows users

docs/windows.md

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+# Tips for windows users
+
+Read below if you are building SonarJS on Windows.
+
+## Windows configuration
+
+You should give yourself permissions to create symbolic links (required by PathWalkerTest.java) or run the build script with Admin rights
+
+- run `gpedit.msc` (Edit Group Policy)
+- Computer Configuration → Windows Settings → Security Settings → Local Policies → User Rights Assignment → Create symbolic links
+- Add yourself (or Users group)
+- restart the machine
+
+## Git configuration
+
+- `git config --system core.autocrlf input`
+- `git config --system core.longpaths true`