Add Project.toml and bump version to 0.5.3 (#188)

Author: nalimilan

Project.toml

@@ -0,0 +1,18 @@
+name = "CategoricalArrays"
+uuid = "324d7699-5711-5eae-9e2f-1d82baa6b597"
+version = "0.5.3"
+
+[deps]
+Compat = "34da2185-b29b-5c13-b0c7-acf172513d20"
+Future = "9fa8497b-333b-5362-9e8d-4d0656e87820"
+Missings = "e1d29d7a-bbdc-5cf2-9ac0-f12de2c33e28"
+Printf = "de0858da-6303-5e67-8744-51eddeeeb8d7"
+Reexport = "189a3867-3050-52da-a836-e630ba90ab69"
+Requires = "ae029012-a4dd-5104-9daa-d747884805df"
+
+[extras]
+JSON = "682c06a0-de6a-54ab-a142-c8b1cf79cde6"
+Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+
+[targets]
+test = ["JSON", "Test"]