feat: Add radio background emulator

.coveragerc

@@ -0,0 +1,15 @@
+
+[path]
+omit =
+    models/
+    tests/
+    */tmp/*
+    */site-packages/py21cmemu/*
+
+[run]
+branch = True
+omit =
+    models/
+    tests/
+    */tmp/*
+    */site-packages/py21cmemu/*

docs/requirements.txt

@@ -10,3 +10,4 @@ sphinx>=5.2.0
 sphinx-click>=4.4.0
 tensorflow>=2.6.0
 toml==0.10.2
+torch>=1.9.0