:pencil: added overview

docs/overview.md

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+```mermaid
+graph TD
+    A[START] -->|"load()"| B(View: /)
+    B --> T{logged in?}
+    T --> |YES| M(View: /queue)
+    T --> |NO| L(View: /login)
+    L --> |"login()"| C{has Profile + User?}
+    C --> |YES| B
+    C --> |NO| E(View: /survey?p=1)
+    E --> |NEXT| F(View: /survey?p=2)
+    F --> G{survey complete?}
+    G --> |NO| E
+    G --> |YES| H(POST: /user)
+    H --> |SAVE| I(POST: /profile)
+    I --> |GENERATE| J(POST: /profile/score)
+    J --> |FORWARD| M
+    AD --> |NO| AF(show Profile)
+    AF --> Q{YAY or NAY?}
+    Q --> |YAY| R(POST: /queue/:tid/delete)
+    Q --> |NAY| S(POST: /queue/:tid/reinsert)
+    S --> |NEXT| M
+    R --> |"joinGrouping()"| U{Grouping exists?}
+    U --> |YES| V(MATCHED)
+    U --> |NO| W(Create Grouping + Membership)
+    W --> |FORWARD| M
+    V --> |"sendNotification()"| X(Alert Both Profiles)
+    X --> |FORWARD| Z{Check revealed Tags?}
+    Z --> |"insertHidden()"| N(View: /matched/:id)
+    Z --> |"hide()"| N(View: /matched/:id)
+    N --> |"reveal()"| AA(POST: /tag/reveal)
+    AA --> |"sendNotifications()"| Z
+    AA --> |"saveTagAssociation()"| AB(POST: /tag)
+    N --> |"sendMessage()"| AC(PubNub)
+    AC --> |"getMessages()"| N
+    M --> AD{on blocked list?}
+    AD --> |YES| AE(Hide Profile)
+    AE --> M
+```