Add Selene configuration files

selene.toml

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+std="vim"

vim.toml

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+[selene]
+base = "lua51"
+name = "vim"
+
+[vim]
+any = true
+
+[[describe.args]]
+type = "string"
+[[describe.args]]
+type = "function"
+
+[[it.args]]
+type = "string"
+[[it.args]]
+type = "function"
+
+[[before_each.args]]
+type = "function"
+[[after_each.args]]
+type = "function"
+
+[assert.is_not]
+any = true
+
+[[assert.equals.args]]
+type = "any"
+[[assert.equals.args]]
+type = "any"
+[[assert.equals.args]]
+type = "any"
+required = false
+
+[[assert.same.args]]
+type = "any"
+[[assert.same.args]]
+type = "any"
+
+[[assert.truthy.args]]
+type = "any"
+
+[[assert.spy.args]]
+type = "any"
+
+[[assert.stub.args]]
+type = "any"