Add reference for Probe

README.md

@@ -5,3 +5,5 @@ Please water the Herbs.
 [![Coverage](https://codecov.io/gh/Herb-AI/Garden.jl/branch/main/graph/badge.svg)](https://codecov.io/gh/Herb-AI/Garden.jl)
 [![PkgEval](https://JuliaCI.github.io/NanosoldierReports/pkgeval_badges/G/Garden.svg)](https://JuliaCI.github.io/NanosoldierReports/pkgeval_badges/G/Garden.html)
 [![Aqua](https://raw.githubusercontent.com/JuliaTesting/Aqua.jl/master/badge.svg)](https://github.com/JuliaTesting/Aqua.jl)
+
+Each synthesis approach has its own directory within `src/<approach>/` and its own test file `test/test_<approach>.jl`. Within the `src/<approach>/` directory, there is a `README.md` file that describes the approach and an `<approach>.bib` file that contains any references for the approach. Preferably, make use of https://dblp.org/ for references to keep the bibliography consistent. 

src/probe/README.md

@@ -0,0 +1 @@
+# Probe

src/probe/probe.bib

@@ -0,0 +1,11 @@
+@article{DBLP:journals/pacmpl/BarkePP20,
+  author       = {Shraddha Barke and
+                  Hila Peleg and
+                  Nadia Polikarpova},
+  title        = {Just-in-time learning for bottom-up enumerative synthesis},
+  journal      = {Proc. {ACM} Program. Lang.},
+  volume       = {4},
+  number       = {{OOPSLA}},
+  pages        = {227:1--227:29},
+  year         = {2020}
+}