Add README

README.md

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+# Data from ons.org.br
+
+Archive of data from https://www.ons.org.br/paginas/energia-agora/balanco-de-energia
+
+http://tr.ons.org.br/Content/GetBalancoEnergetico/null is downloaded every 1 minute and archived in this repo
+
+## Paths
+The `Data` field in JSON split on `T` and turned into path:
+```
+Data = 2024-05-07T20:36:00-03:00
+Path = 2024-05-07/20:36:00-03:00.json
+```
+
+## Example contents
+```json
+{
+    "Data": "2024-05-07T20:36:00-03:00",
+    "sudesteECentroOeste": {
+        "geracao": {
+            "total": 37683.9922,
+            "hidraulica": 27161.5449,
+            "termica": 3582.377,
+            "eolica": 4,
+            "nuclear": 1999.80811,
+            "solar": 9.089946,
+            "itaipu50HzBrasil": 1622.7699,
+            "itaipu60Hz": 3304.40381
+        },
+        "cargaVerificada": 52773.543,
+        "importacao": 15089.55,
+        "exportacao": 0
+    },
+    "sul": {
+        "geracao": {
+            "total": 16240.041,
+            "hidraulica": 14475.53,
+            "termica": 845.0856,
+            "eolica": 918.4256,
+            "nuclear": 0,
+            "solar": 1
+        },
+        "cargaVerificada": 15541.2344,
+        "importacao": 125.392754,
+        "exportacao": 824.1998
+    },
+    "nordeste": {
+        "geracao": {
+            "total": 19959.6563,
+            "hidraulica": 5740.90625,
+            "termica": 338.042236,
+            "eolica": 13879.58,
+            "nuclear": 0,
+            "solar": 1.12817049
+        },
+        "cargaVerificada": 13911.2139,
+        "importacao": 0,
+        "exportacao": 6049.51465
+    },
+    "norte": {
+        "geracao": {
+            "total": 16098.0938,
+            "hidraulica": 14871.8467,
+            "termica": 1121.35986,
+            "eolica": 104.886833,
+            "nuclear": 0,
+            "solar": 0
+        },
+        "cargaVerificada": 7882.2583,
+        "importacao": 0,
+        "exportacao": 8215.835
+    },
+    "internacional": {
+        "argentina": -0.0020888173,
+        "paraguai": 0,
+        "uruguai": -125.390663
+    },
+    "intercambio": {
+        "internacional_sul": 125.392754,
+        "sul_sudeste": 824.1998,
+        "sudeste_nordeste": -773.3108,
+        "sudeste_norteFic": -13492.0391,
+        "norte_norteFic": 8215.835,
+        "norteFic_nordeste": -5276.204
+    }
+}
+```