pack: initialise pack with base mods

These generally do not affect gameplay and the rest of the pack are
built upon this baseline.

mods/calcmod.pw.toml

@@ -0,0 +1,13 @@
+filename = 'calcmod-1.4.3+fabric.1.21.9.jar'
+name = 'CalcMod'
+side = 'both'
+
+[download]
+hash = 'd783e84b0fa1b894afdec146c8b0c5bd28dad1e8cab45314d60f04b2fec8a0f6825da500c4a9fac37bee21e1af7b4c6cf5e6748f28a8a108198d9a345307c079'
+hash-format = 'sha512'
+mode = 'url'
+url = 'https://cdn.modrinth.com/data/XoHTb2Ap/versions/tIJEZz19/calcmod-1.4.3%2Bfabric.1.21.9.jar'
+
+[update.modrinth]
+mod-id = 'XoHTb2Ap'
+version = 'tIJEZz19'