Use DPC++ runtime from package dpcpp_cpp_rt (#175)

* Update README.md
* Update meta.yaml

Author: PokhodenkoSA

README.md

@@ -20,13 +20,16 @@ Build and Install Conda Package
 conda create -n build-env conda-build
 conda activate build-env
 ```
-2. Build conda package
+2. Set environment variable `ONEAPI_ROOT` and build conda package
 ```bash
-conda build conda-recipe
+export ONEAPI_ROOT=/opt/intel/oneapi
+conda build conda-recipe -c ${ONEAPI_ROOT}/conda_channel
 ```
-On Windows to cope with [long file names](https://github.com/IntelPython/dpctl/issues/15):
+On Windows to cope with [long file names](https://github.com/IntelPython/dpctl/issues/15)
+use `croot` with short folder path:
 ```cmd
-conda build --croot=C:/tmp conda-recipe
+set "ONEAPI_ROOT=C:\Program Files (x86)\Intel\oneAPI\"
+conda build --croot=C:/tmp conda-recipe -c "%ONEAPI_ROOT%\conda_channel"
 ```
 
 :warning: **You could face issues with conda-build=3.20**: Use conda-build=3.18!
@@ -52,7 +55,7 @@ python setup.py develop
 
 Using dpCtl
 ===========
-dpCtl relies on DPC++ runtime. With Intel oneAPI installed you should activate it.
+dpCtl relies on DPC++ runtime. With Intel oneAPI installed you could activate it.
 
 On Windows:
 ```cmd
@@ -63,6 +66,12 @@ On Linux:
 source ${ONEAPI_ROOT}/compiler/latest/env/vars.sh
 ```
 
+When dpCtl is installed via conda package
+then it uses DPC++ runtime from `dpcpp_cpp_rt` package
+and it is not necessary to activate oneAPI DPC++ compiler environment.
+
+`dpcpp_cpp_rt` package is provided by oneAPI `conda_channel`.
+
 Examples
 ========
 See examples in folder `examples`.

conda-recipe/meta.yaml

@@ -26,6 +26,7 @@ requirements:
     run:
         - python
         - numpy >=1.17
+        - dpcpp_cpp_rt
 
 about:
     home: https://github.com/IntelPython/dpCtl.git