Add the preview of Glue (#75)

.htaccess

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+<IfModule mod_rewrite.c>
+    RewriteEngine On
+
+    # Hackaround to combine astro with PHP
+    RewriteCond %{REQUEST_URI} ^/api/
+    RewriteRule ^api/(.*)$ api/index.php?p=$1 [QSA,L]
+
+    # If not api route, then deliver static contents
+    RewriteCond %{REQUEST_FILENAME} !-f
+    RewriteCond %{REQUEST_FILENAME} !-d
+    RewriteRule ^(.*)$ $1 [L]
+</IfModule>
+

docs/4-glue-php-astro.md

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+## How glue works?
+
+As discussed above, the project incoperates both PHP and astro.
+I accomplished this with `.htaccess` and playing with *Apache2* 
+configuration.
+
+As of this commit(check file's commit hash), the project requires
+a special directory structure of the webroot...
+
+- a directory with name `/api` and contains all the PHP stuff
+- root directory is then populated with astro build artifacts.
+
+> refer .htaccess file for logic of the **glue**