sdvx: add merge sdvx csv script

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+# e-amusement SDVX CSV to Tachi WARNING!!!
+The CSV provided by Konami doesn't contain any information regarding the date which you played/obtained a particular score. It only keeps your BEST score.
+
+This causes for duplicate imports if you use this script more than once
+
+## Solution
+The first time you import, run `sdvx_csv_to_tach.py` and import the output JSON file normally. Howver **KEEP THE OLD CSV FILE**
+
+The next time you play, export the CSV again but first run `eamuse_merge_csv.py --old <file> --new <file>`. Passing the old and new CSV files accordingly.
+
+This will check for differences between the 2 files and remove lines of the same value in the new file so that only newly obtained best scores are uploaded.
+
+# What if I want all plays?
+I don't think there's a method right now to automatically import arcade data into Tachi for each play. Play history is locked behind the eAmusement basic subscription plan.
+
+The best you can do is download the eAmusement app, subscribe the the basic course and manually make your own score CSV in the same format. Then run `sdvx_csv_to_tach.py`
+
+Alternatively, you can take pictures of each play result screen and build your own JSON so that there is even more info available!