add "Transaction Weight" to Moneropedia

[erciccione]

Issue originally created by @stooge_coaster

This issue was created on gitlab and then migrated here. Only the original post was migrated, not the comments. Please take a look at the discussions on the original Gitlab issue before commenting here: https://repo.getmonero.org/monero-project/monero-site/-/issues/1033

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I'm suggesting ArticMine's description of transaction weight to be included in Moneropedia. His recent talk at 36c3 helps to elaborate on the transaction fee breakdown.

"Transaction weight is the metric used for an adjusting fee. Transaction weight is used to set the fee for a transaction" Refer to scalability to see how transaction weight is calculated.

Link to the scalability moneropedia post

scalability