Added charter for Cross-Foundation Alignment WG (previously Baseline)

[eddie-knight]

Belated charter for #1313

During the course of drafting this with @mnm678, we considered that a different name may better encapsulate the goals of the WG.

cc/ @mlieberman85

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[mrcdb]

I agree with the change in the WG name based on the fact that the WG may be a way for interested TAG members to familiarise with cross-foundation activities with the OpenSSF if they aren't already involved in both foundations.

I believe this WG may not follow the same pattern as other WGs that have a long pipeline of work (e.g. security reviews). Therefore if there were no cross-foundation activities (as with the baseline we are currently working on), there would not be a need for recurring meetings.