pack: initialise pack with base mods

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

mods/fabric-api.pw.toml

@@ -0,0 +1,13 @@
+filename = 'fabric-api-0.138.0+1.21.10.jar'
+name = 'Fabric API'
+side = 'both'
+
+[download]
+hash = '723e0c4fcd8287f085344cde87aeac23d4b13652a50404a42363417e1bd47fe79038c304c92327728b7c96b9216cff5eb9091ce41aeca535aa93a543a1039c9d'
+hash-format = 'sha512'
+mode = 'url'
+url = 'https://cdn.modrinth.com/data/P7dR8mSH/versions/UuXf1NbU/fabric-api-0.138.0%2B1.21.10.jar'
+
+[update.modrinth]
+mod-id = 'P7dR8mSH'
+version = 'UuXf1NbU'