Fixes PolicyEngine#273

policyengine_us/parameters/gov/states/or/liheap/eligibility.yaml

@@ -0,0 +1,14 @@
+description: "Oregon provides assistance for households with income below 60% of the state median income through the LIHEAP program."
+values:
+  2021-01-01: 0.6
+metadata:
+  period: year
+  unit: /1
+  label: Oregon LIHEAP eligibility threshold
+  reference:
+    - title: Oregon Administrative Rules, Chapter 813, Division 200
+      href: https://oregon.public.law/rules/oar_813-200-0020
+      #legal code points to the program manual
+    - title: Oregon Department of Housing and Community Services, Utility Bill Payment Assistance Programs
+      href: https://www.oregon.gov/ohcs/energy-weatherization/pages/utility-bill-payment-assistance.aspx 
+