Add global readme with progress

README.md

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+# Cyber Santa is Coming to Town
+
+## Challenges
+
+- Web
+  - [ ] Toy Workshop
+  - [ ] Toy Management
+  - [ ] GadgetSanta
+- Pwm
+  - [ ] MrSnowy
+  - [ ] Sleigh
+  - [ ] NaughtyList
+- Crypto
+  - [X] CommonMistake
+  - [ ] XMASSpirit
+  - [X] MissingRaindeer
+- Reversing
+  - [X] Infiltration
+  - [ ] Gift Wrapping
+  - [ ] Intercept
+- Forensics
+  - [X] babyAPT
+  - [ ] Honeypot
+  - [ ] Persist