docs: add how to install awkward for PyCall.jl (#38)

* docs: add how to install awkward for PyCall.jl

* Update src/pycall/README.md

Co-authored-by: Jerry Ling <proton@jling.dev>

* Update src/pycall/README.md

Co-authored-by: Jerry Ling <proton@jling.dev>

---------

Co-authored-by: Jerry Ling <proton@jling.dev>

src/pycall/README.md

@@ -0,0 +1,22 @@
+[PyCall](https://github.com/JuliaPy/PyCall.jl) is currently configured to use the Julia-specific Python distribution
+installed by the [Conda.jl](https://github.com/JuliaPy/Conda.jl) package.
+
+  conda create --name ak-julia
+  conda activate ak-julia
+  conda install -c conda-forge awkward
+
+```julia
+using Conda
+Conda.add("awkward")
+```
+
+```julia
+using PyCall
+
+const ak = pyimport("awkward")
+
+test() = println(ak.__version__)
+
+test()
+2.4.6
+```