Add README

README.md

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+# kconfig-frontends
+
+Kconfig tool for XiUOS
+
+The development environment: Ubuntu18.04
+
+## First install the dependency packages
+
+```
+$ sudo apt update
+$ sudo apt install git
+$ sudo apt install build-essential pkg-config
+$ sudo apt install gcc make libncurses5-dev openssl libssl-dev bison flex libelf-dev autoconf libtool gperf libc6-dev
+```
+
+## Make and install
+
+```
+$ cd kconfig-frontends
+$ ./xs_build.sh
+```
+
+If this step doesn't work correctly, use
+
+```
+$ sudo ./xs_build.sh
+```