Add conda recipe

.conda/recipe/bld.bat

@@ -0,0 +1,29 @@
+setlocal EnableDelayedExpansion
+@echo on
+
+:: Make a build folder and change to it
+cmake -E make_directory buildconda
+cd buildconda
+
+:: configure
+cmake -G "Ninja" ^
+    -DCMAKE_BUILD_TYPE:STRING=Release ^
+    -DCMAKE_INSTALL_PREFIX:PATH="%LIBRARY_PREFIX%" ^
+    -DCMAKE_PREFIX_PATH:PATH="%LIBRARY_PREFIX%" ^
+    -DGR_PYTHON_DIR:PATH="%SP_DIR%" ^
+    -DENABLE_DOXYGEN=OFF ^
+    -DENABLE_TESTING=ON ^
+    ..
+if errorlevel 1 exit 1
+
+:: build
+cmake --build . --config Release -- -j%CPU_COUNT%
+if errorlevel 1 exit 1
+
+:: install
+cmake --build . --config Release --target install
+if errorlevel 1 exit 1
+
+:: test
+ctest --build-config Release --output-on-failure --timeout 120 -j%CPU_COUNT%
+if errorlevel 1 exit 1