Start using sinatra & ruby for backend

Signed-off-by: Syed Daanish <me@syedm.dev>

Gemfile.lock

@@ -0,0 +1,40 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    base64 (0.3.0)
+    bigdecimal (3.2.2)
+    logger (1.7.0)
+    mustermann (3.0.3)
+      ruby2_keywords (~> 0.0.1)
+    rack (3.1.16)
+    rack-protection (4.1.1)
+      base64 (>= 0.1.0)
+      logger (>= 1.6.0)
+      rack (>= 3.0.0, < 4)
+    rack-session (2.1.1)
+      base64 (>= 0.1.0)
+      rack (>= 3.0.0)
+    ruby2_keywords (0.0.5)
+    sequel (5.93.0)
+      bigdecimal
+    sinatra (4.1.1)
+      logger (>= 1.6.0)
+      mustermann (~> 3.0)
+      rack (>= 3.0.0, < 4)
+      rack-protection (= 4.1.1)
+      rack-session (>= 2.0.0, < 3)
+      tilt (~> 2.0)
+    tilt (2.6.0)
+    xxhash (0.6.0)
+
+PLATFORMS
+  ruby
+  x86_64-linux
+
+DEPENDENCIES
+  sequel
+  sinatra
+  xxhash
+
+BUNDLED WITH
+   2.6.9