add dotnet bashrc stuff

bashrc.d/dotnet.bashrc

@@ -0,0 +1,19 @@
+# https://learn.microsoft.com/en-us/dotnet/core/install/linux-scripted-manual#scripted-install
+
+function install_dotnet {
+	if command -v dotnet &> /dev/null; then
+		echo "dotnet is already installed."
+		return 1
+	fi
+
+	wget https://dot.net/v1/dotnet-install.sh -O ${HOME}/bin/dotnet-install.sh
+	chmod +x ${HOME}/bin/dotnet-install.sh
+	${HOME}/bin/dotnet-install.sh
+	mkdir -p ${HOME}/.dotnet/tools
+
+	rm ${HOME}/bin/dotnet-install.sh
+}
+
+if [ -d "${HOME}/.dotnet" ]; then
+	export PATH=${PATH}:${HOME}/.dotnet:${HOME}/.dotnet/tools
+fi