refactor #1 + adding documentation (#36)

Reviewed-on: #36
Co-authored-by: Koda YeenBean <n122330@gmail.com>

Makefile.standalone

@@ -10,7 +10,7 @@
 #   make -f Makefile.standalone install
 
 CC      = gcc
-CFLAGS  = -Wall -Wextra -O2 -I/usr/include -DENABLE_LOGGING=1
+CFLAGS  = -Wall -Wextra -O2 -I/usr/include -Isrc -Isrc/inform -Isrc/wlan -DENABLE_LOGGING=1
 LDFLAGS = -lmbedtls -lmbedcrypto -luci -ljson-c
 
 SRCS = src/main.c \
@@ -19,8 +19,16 @@ SRCS = src/main.c \
        src/crypto.c \
        src/http.c \
        src/announce.c \
-       src/inform.c \
-       src/wlan.c \
+       src/inform/inform.c \
+       src/inform/payload.c \
+       src/inform/packet.c \
+       src/inform/response.c \
+       src/wlan/common.c \
+       src/wlan/uci.c \
+       src/wlan/radio.c \
+       src/wlan/provision.c \
+       src/wlan/legacy.c \
+       src/wlan/telemetry.c \
        src/sysinfo.c \
        src/clients.c \
        src/lldp.c \