Add stub and Catalyst links to README. Closes #7

Author: uhbif19

README.md

@@ -3,4 +3,20 @@
 # CEM SDK
 
 * @todo #3 Take decision if to change project name to CEM SDK
-* @todo #3 Fill in README stub from Catalyst proposal
+* @todo #3 Found out if we can make PDD bot descriptions and mentions less noisy
+
+## Project pitch
+
+Define and reuse Cardano DApp logic via annotated CEM-machines, resulting in free implementations for:
+
+* On-chain scripts
+* Tx building/submission/resubmission on L1/L2/emulated testnet
+* Tx parsing/indexing
+* Automatically testing invariants
+* Human-readable specs
+
+## Project status
+
+Project is in early development stage and is funded by
+[Catalyst proposal](https://projectcatalyst.io/funds/10/f10-development-and-infrastructure/mlabs-cemscript-sdk-get-your-dapp-implementation-from-annotated-on-chain-logic-state-machine).
+Detailed milestones of proposal and their status [are available](https://milestones.projectcatalyst.io/projects/1000118) as well.