doc: add FAQ

README.md

@@ -208,6 +208,58 @@ These scripts execute lint and lint:fix respectively, to all monorepo packages.
 
   A: Please update the node version to **14.0.0** or higher. [nvm](https://github.com/nvm-sh/nvm) may be able to help you
 
+- Q: Why do I get `CMake executable is not found` when I install `@rei-network/cli`?
+
+  <details><summary> like this </summary>
+
+  ```
+  npm ERR! code 1
+  npm ERR! path /root/.nvm/versions/node/v14.16.1/lib/node_modules/@rei-network/cli/node_modules/@rei-network/binding
+  npm ERR! command failed
+  npm ERR! command sh -c npm run install:leveldb && npm run install:napi-macros && npm run install:snappy && npm run build
+  npm ERR! > @rei-network/[email protected] install:leveldb
+  npm ERR! > test -d leveldb || git clone https://github.com/REI-Network/leveldb
+  npm ERR!
+  npm ERR!
+  npm ERR! > @rei-network/[email protected] install:napi-macros
+  npm ERR! > test -d napi-macros || git clone https://github.com/hyperdivision/napi-macros
+  npm ERR!
+  npm ERR!
+  npm ERR! > @rei-network/[email protected] install:snappy
+  npm ERR! > test -d snappy || git clone https://github.com/google/snappy
+  npm ERR!
+  npm ERR!
+  npm ERR! > @rei-network/[email protected] build
+  npm ERR! > cmake-js --CDLEVELDB_BUILD_TESTS=OFF --CDLEVELDB_BUILD_BENCHMARKS=OFF --CDLEVELDB_INSTALL=OFF --CDSNAPPY_BUILD_TESTS=OFF --CDSNAPPY_BUILD_BENCHMARKS=OFF --CDSNAPPY_INSTALL=OFF build
+  npm ERR!
+  npm ERR! [
+  npm ERR!   '/root/.nvm/versions/node/v14.16.1/bin/node',
+  npm ERR!   '/root/.nvm/versions/node/v14.16.1/lib/node_modules/@rei-network/cli/node_modules/.bin/cmake-js',
+  npm ERR!   '--CDLEVELDB_BUILD_TESTS=OFF',
+  npm ERR!   '--CDLEVELDB_BUILD_BENCHMARKS=OFF',
+  npm ERR!   '--CDLEVELDB_INSTALL=OFF',
+  npm ERR!   '--CDSNAPPY_BUILD_TESTS=OFF',
+  npm ERR!   '--CDSNAPPY_BUILD_BENCHMARKS=OFF',
+  npm ERR!   '--CDSNAPPY_INSTALL=OFF',
+  npm ERR!   'build'
+  npm ERR! ]
+  npm ERR! clone 'leveldb'...
+  npm ERR! clone 'napi-macros'...
+  npm ERR! clone 'snappy'...
+  npm ERR! info TOOL Using Unix Makefiles generator.
+  npm ERR! info DIST Downloading distribution files to: /root/.cmake-js/node-x64/v14.16.1
+  npm ERR! http DIST  - https://nodejs.org/dist/v14.16.1/SHASUMS256.txt
+  npm ERR! http DIST  - https://nodejs.org/dist/v14.16.1/node-v14.16.1-headers.tar.gz
+  npm ERR! ERR! OMG CMake executable is not found. Please use your system's package manager to install it, or you can get installers from there: http://cmake.org.
+
+  npm ERR! A complete log of this run can be found in:
+  npm ERR!     /root/.npm/_logs/2022-06-24T06_05_09_742Z-debug.log
+  ```
+
+  </details>
+
+  A: Please use your system's package manager to install cmake, like `sudo apt install cmake` or `sudo yum install cmake`
+
 ## License
 
 [GNU General Public License v3.0](https://www.gnu.org/licenses/gpl-3.0.en.html)