Add troubles.

README.md

@@ -2,6 +2,8 @@
 
 ![Bool Questions](https://github.com/makhnanov/telegram-web-app-contest-bool-questions/blob/main/demo_bool_questions.gif?raw=true)
 
+## Demo: [@BoolQuestions](https://t.me/BoolQuestions)
+
 ## Stack: Vanilla JavaScript + PHP without any framework + Redis for fastest storage
 
 ## This app allows you:
@@ -12,7 +14,6 @@
 
 ### Beginner developer perspective:
 - Too less code. Just 260 lines on PHP and 204 lines on JS. No frameworks!
-- My comment's here for describe workflow, for better understanding technologies =)
 
 ### Advanced developer perspective:
 - This is example of long time ago dream, for create social app in tg, released in 24 hours. Need just start write code =)
@@ -24,5 +25,63 @@
 - Also in plans add ability to skip / report bad questions, or add @username, what give ability to dating.
 
 ### Troubles
+At the beginning I get strange (null) error and can't debug. But in one thread in github one ofe user say that in is probably SSL error. \
+I watch 3 my *.crt certificates and combine this chain in one *.crt via next command, and this is solve my problem.
+```shell
+openssl pkcs7 -print_certs < list.p7b > chain.crt
+```
+Also, I too long setup nginx, so part of my config here:
+```shell
+server {
+    listen 80 default_server;
+    server_name  example.com;
+    return 302 https://$server_name$request_uri;
+}
+
+server {
+    server_name www.bro-launcher.com;
+    return 301 $scheme://example.com$request_uri;
+}
+
+server {
+        listen 443 ssl default_server;
+        listen [::]:443 ssl default_server;
+
+        ssl_certificate /root/crt.crt;
+        ssl_certificate_key /root/key.key;
+
+        error_log /var/log/nginx/err.txt;
+
+        index index.html index.php;
+
+        location /api {
+            root /var/www/telegram-contest-bool-questions/;
+            try_files $uri /index.php$is_args$args;
+        }
+
+        location / {
+            index index.html;
+            root /var/www/other-site;
+        }
+
+        location ~ \.php$ {
+            fastcgi_index index.php;
+            fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
+            fastcgi_param SCRIPT_FILENAME /var/www/telegram-contest-bool-questions$fastcgi_script_name;
+            include fastcgi_params;
+      }
+
+      location /telegram-contest-bool-questions/ {
+          alias /var/www/telegram-contest-bool-questions/;
+          try_files $uri $uri/ =404;
+      }
+}
+```
 
 ### Gratitude
+- Especially thanks https://github.com/OxMohsen for his https://github.com/OxMohsen/validating-data library for validate telegram hash for user data.
+
+#### Installation
+```shell
+composer install
+```